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(B) According to Ampere's Circuital Law,the line integral of the magnetic field $\vec{B}$ around any closed path is equal to $\mu_0$ times the net cur

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zero

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(B) According to Ampere's Circuital Law,the line integral of the magnetic field $\vec{B}$ around any closed path is equal to $\mu_0$ times the net current $I_{en}$ enclosed by the path: $\oint \vec{B} \cdot d\vec{l} = \mu_0 I_{en}$.For any point inside an infinitely long thin-walled tube,we can consider a circular Amperian loop of radius $r$ centered on the axis of the tube.Since the current $i$ flows only through the walls of the tube,the current enclosed by any loop inside the tube is $I_{en} = 0$.Therefore,$\oint \vec{B} \cdot d\vec{l} = \mu_0(0) = 0$.This implies that the magnetic induction $B$ at any point inside the tube is zero.

$A$ current $i$ $A$ flows along an infinitely long straight thin-walled tube. The magnetic induction at any point inside the tube is:

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