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Questions  

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

a
The magnetic field is zero only on the axis of the pipe.
b
The magnetic field is different at different points inside the pipe.
c
The magnetic field at any point inside the pipe is zero.
d
The magnetic field at all points inside the pipe is the same, but not zero.

detailed solution

Correct option is C

Consider a circular loop of radius r inside the tube. Then net current inet enclosed by the loop is zero. From the equation ∮B→.dl→=μ0inet⇒∮B→.dl→=0⇒B.2πr=0⇒B=0

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