A) 0.16 J
B) 0.32 J
C) 0.64 J
D) 1.28 J
Correct Answer: B
Solution :
\[U=\frac{1}{2}C{{V}^{2}}=\frac{1}{2}\times 4\times {{10}^{-6}}\times {{(400)}^{2}}=0.32J\]
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