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Q.

Two equal resistances when connected in series to a battery consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed (in watt) is

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answer is 240.

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Detailed Solution

The power consumed when two resistance are in series combination is V2/2R=60 W⇒V2/R=120 W

When the two resistance are connected in parallel combination, power consumed is 2V2/R=120(2)=240 W

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