Answer
$U=6.4 \mu C$
Work Step by Step
The stored energy is given as
$U=\frac{1}{2}CV^2$
putting the values, we get
$U=\frac{1}{2}(3.54\times10^{-11})(600)^2$
$U=6.4\times10^{-6}J$
$U=6.4 \mu C$
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