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A current I flows along the length of a...

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

A

The magnetic field at all point 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

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The correct Answer is:
B
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