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JEE Main 2007 (AIEEE) · Energy Stored & Force between Plates

Energy Stored & Force between Plates question from JEE Main 2007 (AIEEE)

Q35JEE Main 2007 · AIEEEEasy

Energy Stored & Force between Plates

A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and the work done by the battery will be

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Answer: (a)

Battery work $W = QE = CE^2$ .
Energy stored $U = \frac{1}{2}CE^2$ .
$\frac{U}{W} = \frac{1}{2}$
So the answer is (a) $1/2$ .

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