Q. The expression for magnetic induction inside a solenoid of length $L,$ carrying a current $i\ and\ having\ N\ $ number of turns is
A) $\frac{\mu_{0}}{4\ \pi}\frac{N}{L}\ i$
B) $\mu_{0}NLi$
C) $\frac{\mu_{0}}{4\ \pi}$ $NLi$
D) $\mu_{0}\frac{N^{2}}{L}i$
Explanation
(d) $B = \frac{\phi}{A} = \ \frac{\mu_{0}N_{1}Ai}{LA} = \frac{\mu_{0}N^{2}i}{L}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.