Q.

A current i flow along the length of an infinitely long, straight, thin walled pipe. Then

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a

the magnetic field at all points inside the pipe is the same, but not zero

b

the magnetic field is zero only on the axis of the pipe.

c

the magnetic field at any point inside the pipe is zero

d

the magnetic field is different at different points inside the pipe 

answer is A.

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Detailed Solution

See fig.

Question Image

Using Ampere's law, we have
B×2πr=μ0×ienclosed 
Here ienclosed =0
 B=0

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