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Energy of a charged capacitor is U. Now it is removed from a battery and then is connected to another identical uncharged capacitor in parallel. What will be the energy of each capacitor now ?(A) 3U/2 (B) U (C) U/4 (D) U/2 |
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Answer» (C) U/4Explanation:Energy of a CHARGED capacitor = ULet the charge on capacitor be = Q. THUS, the energy Stored : Q²/2CThe flow of charge will be such that the potential DIFFERENCE and total charge (Q) across the capacitor remains same.Hence,Potential difference across the capacitor- V = Q/2CEnergy in each capacitor - 1/2C V²= 1/2C × (Q/2C)²= 1/4 × (1/2 Q²/C)= 1/4UTherefore, the energy of each capacitor will be U/4 . |
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