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
Correct Answer: B
Solution :
Applying Ampere?s law \[\oint{B.dl={{\mu }_{0}}i}\] to any closed path inside the pipe we find no current is enclosed. Hence\[B=0.\]
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