JEE Main 2026 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 6 April 2026, Shift 1, Physics Q45

Question 45 of 75 in this shift, Physics question 20 of 25, Section A.

A LCR series circuit driven with

E_{rms}=90

V at frequency

f_d=30

Hz has resistance

R=80\ \Omega

, an inductance with inductive reactance

X_L=20.0\ \Omega

and capacitance with capacitive reactance

X_C=80.0\ \Omega

. The power factor of the circuit is ________.

(1)0.8Official answer
(2)0.64
(3)0.9
(4)0.5

Official answer

Option 1

NTA final key.

Chapter: Alternating Current
Topic: Phasor Diagrams
Idea tested: Power Factor from Phasors

Same idea in other shifts

Asked 4× in all

9 Apr 2024, Shift 2 · Q53A capacitor of reactance $4\sqrt{3}\ \Omega$ and a resistor of resistance $4\ \Omega$ are connected in series with an ac source of peak…MediumNumerical value
31 Jan 2024, Shift 2 · Q43An AC voltage $V=20\sin 200\pi t$ is applied to a series LCR circuit which drives a current $I=10\sin\left(200\pi t+\frac{\pi}{3}\right)$ .…EasySingle correct
6 Sep 2020, Shift 2 · Q23In a series LR circuit, power of 400 W is dissipated from a source of 250 V, 50 Hz. The power factor of the circuit is 0.8. In order to…MediumNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.