4.0 x 10-26J
4.0 x 10-21J
6.4 x 10-20J
3.2 x 10-15J
2.5 x 10-20J
Correct answer is D
E = \(\frac{1}{2}QV = \frac{1}{2} \times 1.6 \times 10^{-19} \times 40000\)
= 3.2 x 10-15J
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