Electric potential energy stored in a capacitor (17-17)

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Question

The electric potential energy stored in a charged capacitor...

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Question

…can be expressed in three ways in terms of the charge $q$ , potential difference $V$ , and capacitance $C$ .

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Review

Equation 17-17 says that the energy stored in a charged capacitor is proportional to the square of the charge $q$ or, equivalently, to the square of the potential difference (voltage) $V$ across the capacitor. These results are true for capacitors of all kinds, not just the simple parallel-plate capacitor that we discussed in Section 17-5.