Q. The current in a coil changes from $4\ ampere$ to zero in $0.1\ s$. If the average e.m.f. induced is $100\ volt$, what is the self inductance of the coil
A) $2.5\ H$
B) $25\ H$
C) $400\ H$
D) $40\ H$
Explanation
(a) $e = L\frac{di}{dt} \Rightarrow 100 = L \times \frac{4}{0.01} \Rightarrow L = 2.5\ H$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.