Q. The impedance of a circuit consists of $3\ ohm$ resistance and $4\ ohm$ reactance. The power factor of the circuit is
A) 0.4
B) 0.6
C) 0.8
D) 1.0
Explanation
(b) $Z = \sqrt{R^{2} + X^{2}} = \sqrt{4^{2} + 3^{2}} = 5$
$\therefore\cos\phi = \frac{R}{Z} = \frac{3}{5} = 0.6$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.