A series LR circuit is connected to an ac source of frequency and the inductive…

PHYSICS · Single correct · CBSE · Physics · Alternating Current · Alternating Current

Problem

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

\omega

and the inductive reactance is equal to

2R

. A capacitance of capacitive reactance equal to

R

is added in series with

L

and

R

. What is the ratio of the new power factor to the old one? (1)

\sqrt{\frac{2}{3}}

(2)

\sqrt{\frac{2}{5}}

(3)

\sqrt{\frac{3}{2}}

(4)

\sqrt{\frac{5}{2}}