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If a heater is connected to 100 V , the ...

If a heater is connected to 100 V , the power delivered is 100 W . Connecting `10Omega` resistance in series with the heater and a resistance to the same 100 V line .waht should be the value of R to obtain 62.5 W power in the heater ?

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The correct Answer is:
`5 Omega`
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