First slide

Ampere's circuital law

Question

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

Moderate

A

The magnetic field at all points along the axis of the pipe is only 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 $\oint B . d l = μ_{0} i$ to any closed path inside the pipe we find no current is enclosed. Hence B = 0.

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