A 55 nanofarad capacitor is connected to a 400 V battery. What potential energy

Question

A 55 nanofarad capacitor is connected to a 400 V battery. What potential energy is stored in the capacitor ?
A. 1.2 x 10^-12J B. 4.4 x 10^-3 J C. 0.040 J D. 0.020J

Thanks. A 55 nanofarad capacitor is connected to a 400 V battery. What potential energy is stored in the capacitor ?
A. 1.2 x 10^-12J B. 4.4 x 10^-3 J C. 0.040 J D. 0.020J

Thanks. A 55 nanofarad capacitor is connected to a 400 V battery. What potential energy is stored in the capacitor ?
A. 1.2 x 10^-12J B. 4.4 x 10^-3 J C. 0.040 J D. 0.020J

Thanks.
A. 1.2 x 10^-12J B. 4.4 x 10^-3 J C. 0.040 J D. 0.020J

Thanks.

Explanation / Answer

Energy stored = CV2/2 where C = 55 x 10-9C and V = 400V

Energy stored = 55 x 10-9 x 4002/2 = 4.4 x 10-3 Joules

Hence energy stored = 4.4 x 10-3 Joules

Option B is correct.

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