Q. A long thin hollow metallic cylinder of radius ‘$R$’ has a current $i\ ampere$. The magnetic induction ‘$B$’-away from the axis at a distance $r$ from the axis varies as shown in
A)
B)
C)
D)
Explanation
(a) Magnetic field inside the hollow metallic cylinder $B_{in} = 0$, and magnetic field outside it $B_{out} \propto \frac{1}{r}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.