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Electrostatic Potential And Capacitance

Question

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What are the expressions for energy of a charged capacitor?

Solution

Energy of a charged capacitor is given by the expressions below:

E = \frac{1}{2} QV = \frac{1}{2} \frac{Q^{2}}{C} = \frac{1}{2} {CV}^{2}

where,
Q is charge on the plates,
V is the potential applied between the plates, and
C is the capacitance of the capacitor.

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