# physics

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A capacitor has stored energy U. If the voltage and plate separation are both doubled, the new stored energy is ____.

• physics -

C=εε₀A/d
Energy =CU²/2 = εε₀A U² /2d
New energy = εε₀A (2U)² /2•2d = εε₀A U² /d= Doubled iniutial energy

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