alleryEnergy stored in a capacitor with charge Q and capacitance C:
AQ²/C
BQ²/(2C)
CCQ²
D2CQ²
Answer & Solution
Correct answer: B. Q²/(2C)
We have U = Q²/(2C).
That is U = (1/2)CV².
So U = (1/2)QV.
Three equivalent forms — useful depending on which two variables you know.
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