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[" 21.The resistance of the filament of ...

[" 21.The resistance of the filament of a lamp increases "],[" with the increase in temperature.A lamp rated "],[100W" and "220V" is connected across "220V],[" power supply.If the voltage drops by "10%" ,then "],[" the power of the lamp will be :- "],[" (1) "90W],[" (2) "81W],[" (3) between "90W" and "100W],[" (4) between "81W" and "90W]

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