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

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

The magnetic field is different at different points inside the pipe.

The magnetic field at any point inside the pipe is zero.

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

answer is C.

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Detailed Solution

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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