Electric Circuits
A capacitor has a capacitance of 6 μF. Calculate the stored energy in it if a DC voltage of 100 V, is applied across it?

 6 × 102 joules.
 2.5 × 102 joules.
 3 × 102 joules.
 4 × 102 joules.

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Electric Circuits
Two electric bulbs have transparent filament of same thickness. It one of them gives 60 W and other gives 100 W, then-

 60 W and 100 W lamp filament have equal length.
 100 W lamp filament has longer length.
 60 W lamp filament has longer length.
 60 W lamp filament has shorter length.

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