Electric Circuits
If the sheet of a backelite is inserted between the plates of an air capacitor, the capacitance will

 becomes zero.
 increase.
 remains unchanged.
 decrease.

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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-

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

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