A battery does 200 ,J of work in charging a capacitor. energy stored in capacitor is ......... J

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2. Electric Potential and Capacitance

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A battery does $200 \,J$ of work in charging a capacitor. The energy stored in the capacitor is ......... $J$

A

$200$

B

$100$

C

$50$

D

$400$

Solution

(b)

$U=\frac{1}{2} C v^2$

$W=C v^2$

$U=\frac{W}{2}=100 \,J \quad$ (half of work is lost in heat)

Standard 12

Physics

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