An electric bulb is designed to draw Po power at Vo voltage, If the voltage is V, it draws P power. Then

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P=V0VP0

P=VV02P0

P=V0V2P0

P=VV0P

answer is B.

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Detailed Solution

Let E be the resistance of each bulb.Then P0=V02R or R=V02P0Further P=V2R=V2V02P0=VV02P0

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