Q. A current of $i$ ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is
A) Infinite
B) zero
C) $\frac{\mu_{0}2i}{4\pi r}$ T
D) $\frac{\mu_{0}i_{0}}{2r}\ $T
Explanation
(b) For a point inside the tube, using Ampere law, $\oint_{}^{}{\overrightarrow{B}.d\ \overrightarrow{I} = \mu_{0}i.\ \ }$Here, we have $i = 0$ for inside the tube.
$\therefore\ B = 0$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.