The observed electric field is identical to that given by the Lorentz-formula E = v X B. Who wrote the music and lyrics for Kinky Boots? At what point in the prequels is it revealed that Palpatine is Darth Sidious? For $r>r_0$ we have magnetic field$$ electrons cannot escape from a conductor and can only be shielded by it by a field inside of it. So for a test test charge at rest outside the wire, the wire will be neutral. This force is called the electrostatic force. Where does the idea of selling dragon parts come from? The current that flows through the wire generates the magnetic field produced by a wire. Standard electrical ovens use 30 to 50 amps and it's measured in kW (kilowatt). Increasing the number of turns of wire in the coil - By increasing the amount of individual conductors cutting through the magnetic field, the amount of induced emf produced will be the sum of all the individual loops of the coil, so if there are 20 turns in the coil there will be 20 times more induced emf than in one . Inside an electrically neutral current-carrying wire, the electric parallel to the wire is zero. ~.$$Integration is made from $r_0$ to $r$. It does not store any personal data. How to say "patience" in latin in the modern sense of "virtue of waiting or being able to wait"? Invitation Letter | Format, Samples and How To Write An Invitation Letter? A wire is not going to have an electric field around it in the common case that the wire is stationary and the density of positive charges (on nuclei) is the same as the density of negative charges (on electrons). This cookie is set by GDPR Cookie Consent plugin. 3 Why a wire carrying an electric current has no electric field around it? Magnetic field due to current carrying wire. Is The Earths Magnetic Field Static Or Dynamic? Step 2: Connect one end of the wire to the positive terminal of the battery, use the electrical . Of course, the electric field inside the wire must be due to some charges and the only place they can be is the surface of the wire. For standard non-metallic (NM) cable, these amperage capacities are: These ratings are for standard copper NM sheathed cable, but there are instances where these amperage ratings vary. These are the heating effect, the chemical effect, and the magnetic effect.The unit of . Figure shows the magnetic field due to a straight wire seen from various angles. One way to explore the direction of a magnetic field is with a compass, as shown by a long straight current-carrying wire in. The cardboard is tapped a few times and the pattern formed by the iron filings is noted. Maybe your explanation works only when the wire is infinitely long? This shows that at the centre of the coil, the magnetic field is the strongest. Analytical cookies are used to understand how visitors interact with the website. To know the effect of magnet on current carrying wire, let's start with an experiment. How many watts does 50 amp service provide? and to assure the confined flow of current. One way to explore the direction of a magnetic field is with a compass, as shown by a long straight current-carrying wire in. You are using an out of date browser. A current will produce a magnetic field but I don't think an electric field will be produced. How can you determine the direction of a magnetic field inside a solenoid? The cookie is used to store the user consent for the cookies in the category "Analytics". 4 mm2 thickness, the 1 AWG copper wire has a current-carrying ampacity of 130 amps at 75C. Conductors, typically in the form of wires, may be used to transmit electrical energy or signals using an alternating current flowing through that conductor. U_i=\frac{d}{dt} \int {dr \frac{dB}{dt}} Are defenders behind an arrow slit attackable? What are some examples of how providers can receive incentives? Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. What does an electric current produces? Which rule helps us to decide the direction of magnetic field and current? ~,$$which means we have the same amount of electric field just outside of the wire! magnetic fields D. neither electric nor magnetic field. How do you find the straight wire in a magnetic field? I am attempting to comprehend the electric field beyond a current carrying wire. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The iron filings show the pattern of the magnetic field while the compasses show the direction of the field. The magnetic field lines are concentric circles as shown in Figure. How is the merkle root verified if the mempools may be different? The d.c. power supply is switched on and the direction shown by the compasses is noted. In addition to its own magnetic field, a current-carrying wire also has a current field. How will you find out the direction of the magnetic field produced by current carrying conductor? Answer: Known: Work done = W = 300 J, Time taken t = 10 s.04-Sept-2015 . So remember that, there is always the two kinds of charges moving in the wire. Force on a Moving Charge in a Magnetic Field Consider the figure below, this figure shows a conductor that is under the influence of a magnetic field. The d.c. power supply is switched off. The internal electric field is the electric field generated by the charges within a material. Correct option is C) According to the laws of electromagnetism, a current carrying conductor is a neutral species unless an external charge or electric field is applied to it. \nabla \times E~=~0 If the current density is not too high, the wire may break up in the solid state. The electric field is determined by the negative gradient of the electric potential, E =grad, as a result of a current carrying wire. But opting out of some of these cookies may affect your browsing experience. The net charge in the current carrying wire is zero. Suppose a conductor carries current I and it is with the length (l). For standard NM cable, these amperage capacities are: 14-gauge wire: 15 amps. What does it mean that the Bible was divinely inspired? How to print and pipe log file at the same time? However, if the pair can still connect to other charges in the vicinity equally strongly, the answer is the opposite and that an electrostatic field does always exist both inside and outside of the current carrying wire. The wire size chart below shows allowable ampacities of insulated conductors rated up to and including 2000 Volts, 60C through 90C (140F through 194F), not more than three current-carrying conductors in raceway, cable, or earth(directly buried), based on ambient air temperature of 30C(86F). The super-position principle explains magnetic fields. A current carrying wire does have an electric field. First loop has one turn and the second loop has four turns. Link-only answers are bad answer. The electrons in these systems create a protective shield around the electric field, allowing it to balance. This formula is used to calculate the electric field due to a current carrying wire. 1 Does a current carrying wire produces electric field? It is better to have more turns of the copper wire. Outside a current carrying conductor, there is, in fact, an electric field. Let $r_0$ be the wire radius. Magnetic Field Due to a Current Carrying Straight Conductor Experiment, magnetic field due to a solenoid carrying current, Magnetic Field Due to a Solenoid Carrying Current Experiment, magnetic field due to current carrying straight conductor, magnetic field due to current through a circular loop, The Magnetic Field Due to a Current in a Coil, The Magnetic Field Due to a Current in a Coil Experiment, The Magnetic Field Due to a Current in a Straight Wire. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. This is because when there is a current flowing through a wire, there is a magnetic field that surrounds the wire. rev2022.12.9.43105. Can virent/viret mean "green" in an adjectival sense? Say in a horizontal wire, from left to right, negative charges moving to the left and positive charges moving to the right. So, According to the laws of electromagnetism a current carrying conductor is a neutral species unless an external charge or electric field is applied to it. So you are saying that copper when in a block of solid must be electrically neutral? 4 Which rule helps us to decide the direction of magnetic field and current? The direction of the vector L is the same as the direction of the current through the wire. As a result, the current generates a magnetic field. Common sizes include 14-, 12-, 10-, 8-, 6-, and 2-gauge wire. Yes there is an electric field outside of a current carrying wire, in a direction along the wire axis (i.e. A current carrying wire does have an electric field. Why is a test charge affected by a static charge but not a moving charge? This cookie is set by GDPR Cookie Consent plugin. In order to maintain the flow of electrons in a current-carrying wire, there must be a potential difference. The size of the force depends on the magnitude of the current of charge and the distance between the charges. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Does a current carrying wire have an electric field, What is the magnetic field due to a infinite wire, What is the formula for magnetic moment, What does Faraday's law state, What is force on current-carrying conductor, What creates a magnetic field, Does a current carrying wire produces both electric and magnetic field, It is also produced as a result of electromagnetism. The other four fingers show the direction of the magnetic field round the wire, as shown in Figure (a). A variable in this expression specifies how a given point is calculated. Your problem is clearly and comprehensively treated by Hans De Vries in: http://chip-architect.com/physics/Magnetism_from_ElectroStatics_and_SR.pdf. Select the type conductor wire material, the circuit voltage and the phase of the circuit. ICSE Previous Year Question Papers Class 10, ICSE Specimen Paper 2021-2022 Class 10 Solved. These cookies will be stored in your browser only with your consent. The wires attract with each other. What is the magnetic field between two current-carrying wires? How the surface charges create an electric field outside the wires? So, the conductor does not induce any electric field around itself. The observed electric field is identical to that given by the Lorentz-formula E = v X B. The magnitude of the magnetic field will be determined by the distance from the wire to the field and the current applied. And for the wire, electric field game is equal to business timidity, role times the current density J So we reply. to maintain the potential around the circuit. But if you look at a section of the wire, what's the net charge on it? For a short wire the electric field isn't zero everywhere. Help us identify new roles for community members. Magnetic field magnitude is determined by the distance from the wire than by its position along the wire. A current carrying wire will have a magnetic field around it. A current carrying wire produces: A. an electric field B. a magnetic field C. both . Because it is a vector, the field has both its direction and magnitude. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company. For a short wire for length $L$, $EL=V$. This is discussed for example, in "Surface charges on circuit wires and resistors play three roles" by J. D. Jackson, in American Journal of Physics July 1996 Volume 64, Issue 7, pp. I want to be able to quit Finder but can't edit Finder's Info.plist after disabling SIP. Yes there is an electric field outside of a current carrying wire, in a direction along the wire axis (i.e. When a current-carrying wire is exposed to the magnetic field it also experiences forces because the charges are moving inside the conductor. One end of the solenoid is a North pole while the other end is a South pole. This implies that a wire is nothing but a collection of moving charges. parallel to the wire). To make an analogy between wire and a water-pipe, a wire without any current flowing through it is not like an empty pipe. Consider HV power lines What's the big deal? There is an electric current in a wire because there is an electric field inside the wire. Electric field strength for a rod vs a wire? An electric current produces a combination of three effects. Alec, for long wires, one would use higher voltage to maintain the electric field, and hence the current, the same. then what is the $E$ in the equation $J=\sigma E$ always we have inside the current which by the way has zero flux through every closed surface inside the wire!! What factors affect the strength of an electromagnet? In the modern electromagnetism textbooks, electric fields in the presence of stationary currents are assumed to be conservative,$$ The Higgs Field: The Force Behind The Standard Model, Why Has The Magnetic Field Changed Over Time. You also have the option to opt-out of these cookies. Oersted Experiment on Magnetic Effect of Current. a current carrying wire has a magnetic field around it but no electric field.there will be electric field around a body only if it has static electricity.in this wire, charges. But for a long wire, $L \rightarrow \infty$ so $E \rightarrow 0$. If it were a current of just charge carriers without a wire--a beam of electrons in a vacuum chamber, for instance--then there would certainly be an associated electric field. . Now, a current carrying wire is essentially a series of charge carriers (electrons) , all moving through the wire. The wires surface cannot be described, as div(J) is not found there. The spinning and circling of an atom's nucleus cause the electric field to be in motion so this also . At a certain point in the magnetic field, the strength of the field will increase if the current is increased. This magnetic field can be visualized as a pattern of circular field lines surrounding a wire. If you are playing in a band with a drummer, you'll need a boost in volume so your sound doesn't get completely drowned out. Solve any question of Magnetic Effects of Electric Current with:- Patterns of problems > Was this answer helpful? Electric current produces a magnetic field. How to calculate the size of a conductor wire? Merchant of Venice Workbook Answers Act 3, Scene 2, Algebra 1 Common Core AnswersChapter 2 Solving Equations Exercise 2.9, Treasure Trove A Collection of ICSE Poems Workbook Answers Chapter 8 The Patriot, Merchant of Venice Workbook Answers Act 2, Scene 8, Algebra 1 Common Core AnswersChapter 2 Solving Equations Exercise 2.3. Later on, in the year 1821, Michael Faraday discovered that a current carrying conductor also gets deflected when it is placed in a magnetic field. How does an electric bell work using electromagnets? The original question was "does a current carrying wire produce electric field outside" As I said, a current carrying wire produces a concentric magnetic field about the wire cross section.Hence there is a radial electric field emanating from the wire surface. I think is that on the outer diameter for a distance tending to zero, the electric field will be same as inside but when you move further outside of the cable towards larger distance, the field will be reducing. This transfer of electrons from one place to another powers our lights, phones, appliances, and many other things we use every day. Going from A to B on a long wire, an electron must experience the same potential drop regardless of path. The direction of the magnetic field can also be determined by Maxwells Corkscrew Rule- Imagine a screw being turned into the wire along the direction of the current. An electric field exists in any material because the charged and current that are present create it. What is a coil of a wire that when carrying an electric current produces a magnetic field? The induced voltage (in this rectangle!) Notice Writing | Format, Template, Examples and Topics of Notice Writing. Why is this the case? This magnetic field may be detected by placing a magnetic compass close to the wire as shown in the figure below. An electric field must be created in order for a wire with a finite conductivity to have current flowing through it. Once we realize surface charges must be on the wire, the presence of electric field outside seems natural. When a material is placed in an electric field, the charge and current will cause free electrons to move around. An electromagnetic field (also EM field or EMF) is a classical (i.e. The cookie is used to store the user consent for the cookies in the category "Performance". The materials electric field is created by both external fields and internal currents within it. As I said, a current carrying wire produces a concentric magnetic field about the wire cross section.Hence there is a radial electric field emanating from the wire surface. For a better experience, please enable JavaScript in your browser before proceeding. The physics is the same as the source, as the fields (in descending order) will be established by the source, and the conductor will serve as a guide for particle currents. The strength of the electric field is determined by the amount of charge on the particles creating the field. Message Writing | Message Writing Format, Examples and How To Write a Message? Solved Examples. The current carrying conductor generates it own magnetic field around it. The thicker wire has a smaller resistance so that the current will be larger. . It only takes a minute to sign up. ~.$$ Using this we get$$ A test charge should be affected by a moving charge just as much as it is affected by a static charge. Is this an at-all realistic configuration for a DHC-2 Beaver? Then $U_i= E(r)\,Z$, one has $E(r)$ ($Z$ disappears! but , if anyhow you can make the wire +ve charged and it remains in this stayed for a durationthen it will produce electric field. CURTIS (1510AS-5350) 48 VOLT, 350 AMP CONTROLLER FOR CLUB CAR IQ (DS AND PRECEDENT) CARS 2000-2008. Once you have calculated the force on wire 2, of course the force on wire 1 must be exactly the same magnitude and in the opposite direction according to Newtons third law. The experimental proof of the presence of the electric field outside a current carrying wire can be achieved by measuring the voltage between any two points along the wire. The plane of circular lines is perpendicular to the length of the wire. Does current produce magnetic field? There is also of course a magnetic field in the azimuthal direction. Why does a current carrying coil produce magnetic field? These cookies ensure basic functionalities and security features of the website, anonymously. Straight current-carrying wire is carried by a magnetic field. The plastic frame is tapped a few times and the pattern formed by the iron filings is noted. The purpose of the calculator is to determine the size of the conductor wire in a circuit of a given distance with a given amperage load. The standard metric unit of power is the Watt. If so they must have created a hydrogen atom with multiple electrons filling one or more of its s,p,d,f shells, but I have not heard of such an atom being created yet! The fields strength is directly proportional to the current flowing through it. Figure shows the magnetic field produced by a current in a circular coil. This is what leads to corona development around wires if the E field is > dialectic breakdown strength of the surrounding medium (usu air). 10A carries a current as a straight conductor, but it is carried by another conductor parallel to it as well. The compasses are removed and some iron filings are sprinkled on the plastic frame. This shows that the strength of the magnetic field decreases as the distance from the wire increases. The quintessence is that a current carrying wire appears electrostatically charged to an observer in relative motion to that wire, even when the same current carrying wire appears uncharged to an observer at rest relative to that wire. The electrons move but for any given volume, the number leaving is equal to the number entering, so there is no change. Does a current carrying wire produce electric field outside? But this contradicts your explanation. We appear to have only 2.5 A left over to maintain our current magnetic field. a stronger field. The combined electrostatic field created both inside and outside of the wire has potentially neutralising positive and a negative components. 855. Did neanderthals need vitamin C from the diet? This cookie is set by GDPR Cookie Consent plugin. Is the charge of a current carrying wire real or hypothetical? The magnetic field is generated by concentric circles of wire around the cable, and the strength of the magnetic field depends on the distance from the wire and the current flowing through it. The magnitude of the magnetic field generated by a current carrying a straight wire is given by a magnitude of r = 2 m, i = 2, and 5T, as shown in Figure 1. Next, Oersted set to find the shape of the magnetic. 2022 Physics Forums, All Rights Reserved, Problem with two pulleys and three masses, Newton's Laws of motion -- Bicyclist pedaling up a slope, A cylinder with cross-section area A floats with its long axis vertical, Hydrostatic pressure at a point inside a water tank that is accelerating, Forces on a rope when catching a free falling weight. The earths magnetic field is about 0.5 gauss. We also use third-party cookies that help us analyze and understand how you use this website. Cross-reference the HM-103 data to position the wires properly in the new RJ-45 connector. This website uses cookies to improve your experience while you navigate through the website. Is it because we are not measuring the electric field with respect to a portion of space such as wire but always to the charges themselves. Yes there is an electric field outside of a current carrying wire, in a direction along the wire axis (i.e. Magnetic field . When a current-carrying conductor is placed in a magnetic field the wire experiences a force due to the interaction between the field and the magnetic field produced by the moving charges in the wire. in this video of "does, current-carrying conductor produces electric field" we have discussed the following topic. It's this electric field that pushes the free electrons to get them to move along. Solution Verified by Toppr Correct option is B) Whenever current is passed through a conductor it develops magnetic field around it , in case wire the magnetic field is circular around it and is given by right hand thumb rule . The spacing between the circles increases as you move away from the wire. The d.c. power supply is switched on again. A thick copper wire is used so that a larger current will flow to produce a stronger magnetic field. But I'm pretty sure moving charges don't make electric . It is better to have more turns of thick copper wire. With a transfer connector (convert kit), the 1266A-5201 can easily replace the 1510A-5251 SX . If the thumb of the right-hand points along the direction of the current, then the remaining curled fingers of the same hand give the magnetic field direction due to the current. piyushpiyu7946 piyushpiyu7946 28.03.2018 Physics Secondary School answered Does a current carrying wire produce a electric field 1 See answer Advertisement To subscribe to this RSS feed, copy and paste this URL into your RSS reader. . Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. The magnetic field is found in this direction by thumb rule. Maybe I was wrong. This is true in both the AC and DC case. AC electric field driving particle currents have both a voltage and a time-varying magnetic source, with a vector potential that is analogous to a voltage and a time-varying magnetic source. The magnetic fields strength can be calculated as well. See. The direction of the magnetic field can be determined using Amperes right-hand grip rule. (The direction of magnetic field around . ), Lenz theorem gives the direction of $E$. What are the fields produced around a current carrying conductor? However, the released electron itself is negatively ionised, which in turn creates a negative radial electric field permeating within and outside of the current carrying wire. This is called the motor effect. The force is acting in the direction of the electric field. JavaScript is disabled. It is the perpendicular or radial in the case of a cylindrical wire that we are concerned with. Electric energy is carried by current, which is the flow of electrons. The electric field is created by the moving charges in the wire. 1. The apparatus is set up as shown in Figure. How does the battery create an electric field inside the conducting wire connected to its terminal? But we are considering a plain wire so I will stick to that. Yes there is an electric field outside of a current carrying wire, in a direction along the wire axis (i.e. The strength of the electric field is proportional to the strength of the current flowing through the wire. ADDED TORQUE.The ampere is the SI unit for electrical current, or the amount of electrical charge that flows through a conductor in a given time. to provide the electric field in the space around the circuit. Problem 1: An electric machine makes use of 300 J of energy to do work in 10s. The field is strongest near the wire and weakens as it approaches the wire. So I just got an EM homework with a coaxial cable, the inner thick wire has current +I and the outer, thin shell has current -I, the problem asks for the magnetic AND electric field all around the cable as well as the Poynting vector. Wire Size Chart and Maximum Amp Ratings. This will be accompanied with a radial Electric field. The force acting on it causes a current to flow in the opposite direction, causing the magnetic field to strengthen once more. Electrical current is measured in ampacity, and each wire gauge has a maximum safe carrying capacity. The electric field due to current carrying wire formula states that the electric field is equal to the current multiplied by the distance from the wire. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The strength of the magnetic field increases when: The d.c. power supply is switched off. When a wire carries a current then electric field? You should not use all Project Ideas in any situation. Non zero voltage will be a proof of the existence of the electric field. This is true in both the AC and DC case. The direction of rotation of the screw is the direction of the magnetic field as shown in Figure (b). This can also be verified by a simple experiment of keeping a magnetic compass near any current-carrying wire. 0 0 Is there any experimental proof? To determine the direction of the electric field, you must imagine a force being applied to a positive test charge. However, a magnetic field is produced in the surroundings. Working Principle of DC MotorA DC motor is an electrical machine which converts electrical energy into mechanical energy. This is what leads to corona development around wires if the E field is > dialectic breakdown strength of the surrounding medium (usu air). How will you find out the direction of the magnetic field produced by current carrying conductor? When a current carrying coil of water is running, creating an electric field, it is called a solenoid. As an electronics engineer, this seems trivially true. In general no. The quintessence is that a current carrying wire appears electrostatically charged to an observer in relative motion to that wire, even when the same current carrying wire appears uncharged to an observer at rest relative to that wire. However, a magnetic field is produced in the surroundings in accordance with Biot-Savart's law The magnetic field from each turn of wire will combine together to form. Is there any reason on passenger airliners not to have a physical lock between throttles? The magnetic field from all the turns of wire will combine together to form a stronger field. Does current carrying conductor has electric field? In this exercise, the horseshoe magnet, like all magnets, has two poles, which are located south and north. 1980s short story - disease of self absorption. The Power Formula is used to compute the Power, Resistance, Voltage or current in an electrical circuit. However, you may visit "Cookie Settings" to provide a controlled consent. Oersted concluded that there exists a magnetic field of a current carrying wire and it shows its effects by deflecting the compass direction. A current-carrying wire or coil can exert a force on a permanent magnet. A metallic wire is electostaticly neutral the mobile negative charges equals the strongly Bounded pisitive charges , so resultant electric field is zero everywhere. Remember, a current carrying wire gives rise to a concentric magnetic field. How do you Determine the Direction of the Magnetic Field? non-quantum) field produced by accelerating electric charges. Conceptually in electrostatics theory, this field must permeate throughout and beyond the confines of the wire. Electrodes, a material with electrons that can quickly move through electric fields, are also known as conductors. But if that were the case, then some current could go outside the wire right? An electric field is generated by electrically charged particles and affects the behavior of other charged particles in the vicinity. Does a current carrying wire produces electric field? Each turn of wire forms its magnetic field. How does a magnetic field affect a current-carrying wire? 1432. magnetic effect of electric current class 10|| #shorts #experiment #scienceexperimentCurrent carrying wire produces magnetic field around it. Because of its shape, the field inside a solenoid can be very uniform, and also very strong. This doesn't seem to answer the question, which is about the experimental proof of $E_\parallel^{out}=E_\parallel^{in}$ in a wire. The direction of the magnetic field is perpendicular to the wire. In our universe, the Earth and the other planets and stars are magnets. The compasses are removed and some iron filings are sprinkled on the cardboard. Current charges (also known as moving charges) cause all magnetic fields to be present. Positive point charges are produced by a current carrying wire, and the force they produce is proportional to the direction of current. Electrons are the negatively charged sub-particles of atoms. Why a wire carrying an electric current has no electric field around it? The magnetic field created by current is present throughout the wire. @DirkBruere, it is very common to think of the DC live wire as uncharged, perhaps because of the theorem which says that in stationary situation, charge density in a conductor vanishes. A magnetic field surrounding the wire is also said to be extremely strong. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. What Is Magnetic Effect Of Electric Current? Amperes Law states that for any closed loop path, the sum of the length elements times the magnetic field in the direction of the length element is equal to the permeability times the electric current enclosed in the loop. The law of gravitational attraction is extremely important in physics, as it explains how electric currents can cause magnetic fields to form. Answer (1 of 2): Yes and no. So outside the wire it's also zero. The charges may be moving inside this surface but they will always be inside it hence a net charge exists and electric field lines will extend outside and a test charge will feel it. A current of charge produces an electric field. Understanding the role played by moving charge in electric field and why charges reside on surface only in current flowing conductor too. A current-carrying wire produces a magnetic field because inside the conductor charges are moving. How is the size of a wire related to the amperage? It is just that in certain cases it is easy to use Amperes law to calculate the magnetic field and in others it is too difficult. Books that explain fundamental chess concepts, What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. Why is it that a current of just charge carriers without a wire--a beam of electrons in a vacuum chamber, then there would be an associated electric field? Magnetic Field Produced by a Current-Carrying Solenoid A solenoid is a long coil of wire (with many turns or loops, as opposed to a flat loop). A current carrying wire of length l is bent into two loops one by one. The size of the wire dictates how much current can safely pass through the wire. parallel to the wire). More importantly, Gauss's law will tell you that the components perpendicular to the wire must also be zero. The magnetic lines are closest to each other at the centre of the coil. If two straight wires are placed side by side, the magnetic fields produced by the currents in them will combine to form a resultant field. 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