Question

A solenoid of inductance 2H carries a current of $1A$. What is the magnetic energy stored in a solenoid?

• A. 2 J
• B. 1 J
• C. 4 J
• D. 5 J

Answer 1

The correct option is B 1 J

Given : $L=2$ H $I=1$ A

Magnetic energy stored $U_m=\frac{1}{2}L{I}^2$

$\therefore$ $U_m=\frac{1}{2}\times 2\times 1^2=1$ J