Q. The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is
A) 0.4
B) 0.5
C) 0.8
D) 1.0
Explanation
[Solution] $V = \sqrt{80^2 + (100 - 40)^2} = 100$ V; $\cos\phi = 80/100 = 0.8$. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.