You are watching: What happens when an electric current passes through a wire
Your reasoning is faulty. It is true the in electro-STATICS (ie when there is no movement of electrical charges) the electrical field inside a conductor is zero. Yet this is no the case for electro-DYNAMICS (ie once charges are in motion), eg once there is an electrical current flowing.
It is additionally true that, for alternative currents, the existing becomes much more concentrated close to the surface of the conductor together the frequency boosts (the Skin Effect). However, when the frequency is low or zero (eg direct current, DC), the present flows transparent the cross-section of the conducting wire, not only close to the surface.
I think you are confusing this two various facts. The an initial one (no electrostatic ar inside a conductor) does not define or reason the second (alternating current concentrated near surface ar of conductor).
I don"t understand what dispute you room making about the usage of Ampere"s Law and also what you discover contradictory.
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edited Jun 6 "16 at 19:02
reply Jun 6 "16 in ~ 17:32
sammy gerbilsammy gerbil
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When friend talk around the current, the electrons enters in the wire from one end and leaves the wire from an additional end. Lock walk slowly, yet each one pushes the following one in front and also you will acquire an instantaneous present flow (close to speed of light). The ion make a neutralizing background, hence the net charge accumulation during current flow is zero. In normal case there is no electrostatic field on the conducting cable (both inside and outside).
When a charge is built up on a conducting surface ar it make the efforts to it is in in lowest power configuration and also since comparable charge repels each other they clear up down come largest possible distance i.e. Equally dispersed on the surface hence the electrical field within the conductor is zero.
I hope the explanation about the processes will help you clarify your confusion.
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reply Jun 6 "16 in ~ 18:48
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When you offer charge to any sphere choose above, charge an initial spread transparent the conductor and not just surface.A current flows within conductor moving electrons and transforming electric ar in conductor.
Now, optimistic charge then uncover that outer surface has less potential 보다 inner. Lock start moving towards surface in type of current. This present stops when all the charges have actually reached surface to make potential same throughout the sphere, so that charges uncover no where to relocate to.
What did friend see?
So, electrostatic is an equilibrium phenomenon.
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What happens in wire?
Inside cable you use an electric field. From positive finish charges relocate throughout conductor come reach negative end.There is no require for lock to relocate towards surface. Electrical potential is uniform transparent cross-section of wire. Existing is always flowing native one end to other end of wire. No from center to surface.
Here , you space not letting an equilibrium case for charge to be concentrated anywhere (not also at ends).This dynamic process hence continues.