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JEE Main 2013 Physics question

PhysicsAlternating CurrentJEE Main 2013

A series LR circuit is connected to an ac source of frequency ω 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 :

Answer: (4)

Solution

Old: , so . New: , $ =

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Question ID VK-104185