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Energy stored in a capacitor:
ACV²
BCV
C½ CV² (= ½ Q²/C)
DQ V
Answer & Solution
Correct answer: C. ½ CV² (= ½ Q²/C)
Capacitor energy: U = ½ CV² = ½ QV = Q²/(2C). Q = CV. Stored as electric field between plates. Discharge can be rapid (lightning bolt). Capacitor banks store energy in pulsed systems.
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