The magnetic energy stored in an inductor of inductance $4 ~\mu \mathrm{H}$ carrying a current of $2 \mathrm{~A}$ is :

Question

$4 \mathrm{~mJ}$

$8 \mathrm{~mJ}$

$8 ~\mu \mathrm{J}$

$4 ~\mu \mathrm{J}$

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