Q. The magnetic field due to a straight conductor of uniform cross section of radius $a$ and carrying a steady current is represented by
A)
B)
C)
D)
Explanation
(a) Magnetic field inside the conductor $B_{in} \propto r\ $and magnetic field outside the conductor $B_{out} \propto \frac{1}{r}$
[where $r$ is the distance of observation point from axis]
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.