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A series L.R circuit connected with an a...

A series L.R circuit connected with an ac source `E=(25sin1000t)V` has a power factor of `(1)/(sqrt(2))` .If the source of emf is changed to `E=(20sin2000t)V` ,the new power factor of the circuit will be :

A

`(1)/(sqrt(5))`

B

`(1)/(sqrt(7))`

C

`(1)/(sqrt(2))`

D

`(1)/(sqrt(3))`

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