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Find the energy stored by the capacitor 3F having a potential of 12V across it.

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Find the energy stored by the capacitor 3F having a potential of 12V across it.

(a) 432

(b) 108

(c) 216

(d) 54

I have been asked this question during a job interview.

This key question is from Method of Images in chapter Electrostatic Boundary Value Problem of Electromagnetic Theory

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Right choice is (c) 216

Easiest explanation: The energy stored in a capacitor is given by, E = 0.5 CV^2.

E = 0.5 x 3 x 12^2 = 0.5 x 432 = 216 units.

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