Field due to straight wire carrying current (inside) | Moving charges & magnetism | Khan Academy

Let's find the expression for the magnetic field inside a straight long wire carrying current. Since the magnetic field is symmetric around the conductor, we can use Ampere's circuital law.
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Created by Mahesh Shenoy

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[@liewts1049]

Dear Khan Academy, might I add that this is applicable to DC current only as only DC current distribution would be even in the conductor.

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[@Adihaivai]

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[@ShazadaBabo]

Dear one...i think B is inversely proportional to just r as we move away from rood ...not r squared...so should graph not follow a straight descending line?after r is greater than R

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I suppose the permeabilities inside the wire and oputside the wire should be different, shouldn't they ?

[@oreowithurea5018]

the formula for ampere law contains absolute permeablity only

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[@blur966]

can this equation be used in the case of a current carrying rod with current uniformly distributed across its cross-section?

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Nice explanation

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[@yogeswaranv9619]

Sir,but by biotsavarts law magnetic field on the conductor is zero .

[@rajaganappathiesshanmugasu3098]

It is a wire

[@shivanshjha938]

Both of u are wrong neither magnetic field inside a conductor is 0 and for ur information wire is made of a conductor if it wasn't there would be no current..go and learn something

[@dragwar_yt3695]

electric field* inside a conductor is 0

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