Q. The magnetic field on the axis of a long solenoid having $n$ turns per unit length and carrying a current $i$ is
A) $\mu_{0}ni$
B) $\mu_{0}n^{2}i$
C) $\mu_{0}ni^{2}$
D) None of these
Explanation
(a) If the solenoid is of infinite length and the point is well inside the solenoid, $B_{in} = \mu_{0}ni.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.