Pyq- Electromagnetic Induction & Alternating Currents L-7

Question: The magnetic energy stored in an inductor of inductance $4 \mu \mathrm{H}$ carrying a current of $2 \mathrm{~A}$ is : (NEET-2023)#

A) $4 \mathrm{~mJ}$

B) $8 \mathrm{~mJ}$

C) $8 \mu \mathrm{J}$

D) $4 \mu \mathrm{J}$

Answer: $8 \mu \mathrm{J}$#

Explanation#

$\text { Energy }=\frac{1}{2} \mathrm{Li}^2$

$=\frac{1}{2} 4 \times 10^{-6} \times 2^2$

$=8 \times 10^{-6} \mathrm{~J}$

$\text { energy }=8 \mu \mathrm{J}$