Question

The magnetic potential energy stored in a certain inductor is 25 $mJ$, when the current in the inductor is 60 $mA$. The inductor is of inductance

• A. 0.138 $H$
• B. 138.88 $H$
• C. 1.389 $H$
• D. 13.89 $H$

Answer 1

The correct option is D 13.89 $H$

Energy stored in a inductor is given as $U=\frac{1}{2}L{I}^2$
$L=\frac{2U}{I^2}$

$L=\frac{2\times 25\times {10}^{-3}}{(60\times {10}^{-3}{)}^2}$

$L=13.89H$