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A 900pF capacitor is charged to 100V by ...

A 900pF capacitor is charged to 100V by a battery. How much energy is stored in the capacitor?

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Here, `C = 900 pF = 900xx10^(-12)F= 9xx 10^(-10)F , V= 100V`
Energy stored within the capacitor,
`E= (1)/(2)CV^2 = (1)/(2)xx(9xx10^(10))xx (100)^2 = 4.5 xx 10^(-6) J`.
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