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If the charge stored in a capacitor is 4C and the value of capacitance is 2F, calculate the energy stored in it.

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If the charge stored in a capacitor is 4C and the value of capacitance is 2F, calculate the energy stored in it.

(a) 2J

(b) 4J

(c) 8J

(d) 16J

I have been asked this question in examination.

This interesting question is from Energy Stored in a Charged Capacitor in portion Capacitance and Capacitors of Basic Electrical Engineering

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Correct answer is (b) 4J

Easy explanation: The expression for finding the value of energy is:

U=Q^2/2C = 4*4/(2*2) = 4J.

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