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Physics
A current I flows along the length of an infinitely long, straight and thin-walled pipe. Then
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Q. A current I flows along the length of an infinitely long, straight and thin-walled pipe. Then
NTA Abhyas
NTA Abhyas 2020
A
The magnetic field at all points inside the pipe is
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 $\ointB.dl=\mu _{0}i$ to any closed path inside the pipe we find no current is enclosed. Hence $B=0$ .