Question

The energy stored in a $50mH$ inductor carrying a current of $4A$ is__________

• A. 0.4 J
• B. 4.0 J
• C. 0.8 J
• D. 0.04 J

Answer 1

Answer: (A)

Given, $L=50mH=5\times 10^{-2}H$
$I=4A$
$\therefore$ Energy stored in the inductor is given as
$E=\frac{1}{2}L{I}^2=\frac{1}{2}\times 5\times 10^{-2}\times 4^2$
$=0.4J$