Q. A long solenoid has $n$ turns per meter and current $I\ A$ is flowing through it. The magnetic field at the ends of the solenoid is
A) $\frac{\mu_{0}nI}{2}$
B) $\mu_{0}nI$
C) Zero
D) $2\mu_{0}nI$
Explanation
(a) $B$ at ends of solenoid is $\frac{\mu_{0}}{2}ni$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.