A) $4 \mathrm{~mJ}$
B) $8 \mathrm{~mJ}$
C) $8 \mu \mathrm{J}$
D) $4 \mu \mathrm{J}$
$\text { Energy }=\frac{1}{2} \mathrm{Li}^2$
$=\frac{1}{2} 4 \times 10^{-6} \times 2^2$
$=8 \times 10^{-6} \mathrm{~J}$
$\text { energy }=8 \mu \mathrm{J}$
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