Q. An ac voltage is applied to a resistance R and inductor L in series. If R and the inductive reactance are both equal to 3 Ω, the phase difference between the applied voltage and the current in the circuit is
A) Zero
B) π/6
C) π/4
D) π/2
Explanation
[Solution from source] For a series LR circuit tan φ = X_L/R = 3/3 = 1, so φ = π/4 with voltage leading the current. π/2 would apply only for a pure inductor. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.