Two electric lamps of $40\, watt$ each are connected in parallel. The power consumed by the combination will be ........... $watt$
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(c) ${P_p} = nP = 2 \times 40 = 80\,W$
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Two coils require $20$ minutes and $60$ minutes respectively to produce same amount of heat energy when connected separately to the same source. If they are connected in parallel arrangement to the same source; the time required to produce same amount of heat by the combination of coils, will be________ $min$
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