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Q.

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

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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

answer is B.

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Detailed Solution

Applying Ampere's law ∮B. dl = μ0i to any closed path inside the pipe we find no current is enclosed. Hence B = 0.
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