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An electric bulb rated for 500 watt at 1...

An electric bulb rated for 500 watt at 100 volt is connected to a 200 volt supply line . How much resistance has to be joined in seresies with the bulb so that , the bulb delivers 500 watt ?

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`20Omega`
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CHHAYA PUBLICATION-ELECTRIC ENERGY AND POWER-Problem Set - I
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