Question

What is the energy stored in a $50mH$ inductor carrying a current of $4A$?

• A. 0.2 J
• B. 0.4 J
• C. 0.05 J
• D. 0.1 J

Answer 1

Answer: (B)

Energy stored in an inductor is given by
$E=\frac{1}{2}L{i}^2$
Given, $L=50mH$
$=50\times 10^{-3}H,i=4A$
$\therefore E=\frac{1}{2}\times 50\times 10^{-3}\times (4{)}^2$
$\Rightarrow E=0.4J$