Correct Answer: Option D

Explanation

E = \(\frac{1}{2}\)QV;

But, Q = CV

∴ E =  \(\frac{1}{2}\)CV\(^2\);

40 = \(\frac{1}{2}\) × 5 × 10\(^{-6}\) × V\(^2\)

V\(^2\) = \(\frac{(2 \times 40)}{5 \times 10^{-6}}\)

V\(^2\) = 16 × 10\(^6\)

∴ V = \(\sqrt{(16 \times 10^6)}\) = 4000 V

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