Question 309: Electromagnetic Induction

Question

The magnetic potential energy stored in a certain inductor is $$25 \mathrm{~mJ}$$, when the current in the inductor is $$50 \mathrm{~mA}$$. This inductor is of inductance

Accepted Answer

Magnetic potential energy $$\mathrm{U}=\frac{1}{2} \mathrm{LI}^2$$
$$\begin{aligned}
	herefore \mathrm{L} & =\frac{2 \mathrm{U}}{\mathrm{I}^2}=\frac{2 	imes 25 	imes 10^{-3}}{\left(50 	imes 10^{-3}ight)^2} \
& =20 \mathrm{H}
\end{aligned}$$

Answer

2.00 H

Answer

0.20 H

Answer

200 H

Answer

20 H

Electromagnetic Induction

The magnetic potential energy stored in a certain inductor is $25 \mathrm{~mJ}, when the current in the inductor is 50 \mathrm{~mA}$. This inductor is of inductance

Choose the correct answer: