Q. If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be
A) Only inside the pipe
B) Only outside the pie
C) Neither inside nor outside the pipe
D) Both inside and outside the pipe
Explanation
(b) Because for inside the pipe $i = 0$
$\therefore B = \frac{\mu_{0}i}{2\pi r} = 0$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.