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[" 15.A serios "LR" circuit is connected...

[" 15.A serios "LR" circuit is connected to an ac source of frequency "w" and the inductive reactance is equal to "2R],[" A capacitance of capacitive reactance equal to "R" is added in series with "L" and "R" .The ratio of the new power "],[" factor to the old one is : "],[[" (1) "sqrt((2)/(5))," (2) "sqrt((2)/(3))," (3) "sqrt((3)/(2))," (4) "sqrt((5)/(2))]]

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