First slide

Ampere's circuital law

Question

A current I flows along the length of an infinitely long, straight and thin-walled pipe. Then

Easy

A

The magnetic field at all points inside the pipe is the same but not zero
B

The magnetic field at any point inside the pipe is zero
C

The magnetic field is zero only on the axis of the pipe
D

The magnetic field is different at different points inside the pipe

Solution

Applying Ampere's law, $\oint B . dl = μ_{0} i$ to any closed path inside the pipe we find no current is enclosed. Hence, B = 0.

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