Q. An inductor having coefficient of self induction 40mH. What is the energy stored in it when a current of 2 A is passed through it?
A) 40mJ
B) 80mJ
C) 20mJ
D) 100mJ
Explanation
(b) Energy stored in inductor
$E = \frac{1}{2}LI^{2} = \frac{1}{2} \times 40 \times (2)^{2}mJ$
= 80 mJ
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.