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A capacitor stores 4 μC at 500 V. How much energy does it hold?
A2 mJ
B1 mJ
C4 mJ
D0.5 mJ
Answer & Solution
Correct answer: B. 1 mJ
U = (1/2)QV = 0.5 × 4×10⁻⁶ C × 500 V = 1×10⁻³ J.
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