The energy stored in an inductor of inductance 5mH when a current of 6A flows through it is?

A. 9.0 x 10^-3J
B. 9.0 x 10^-2J
C. 1.4 x 10^-2J
D. 1.8 x 10^-3J

Correct Answer:

Option B – 9.0 x 10^-2J

Explanation

Energy stored in a coil of inductance, L, and carry a current, I is given by
Energy stored in a coil of inductance, L, and carry a current, I is given by
E = ¹/₂ L I²
= ¹/₂ x 5 x 10^-3 x 6 x 6
= 9.0 x 10^-2J