JEE Main Physics · Alternating Current

Power Factor from Phasors

Power Factor from Phasors (Alternating Current) was asked 4 times in 4 JEE Main shifts, 2020–2026, out of the 42 shifts Lumi analysed. 2 of the 4 had a numerical answer.

Times asked: 4; in 4 shifts
Years: 2020–2026
Usual format: Numerical value; Calculation
Pattern: Frequent; repeats across shifts

How it is asked

Power factor of series lcr
Average power from v and i phase

Difficulty

Easy 2Medium 2Hard 0

Where it sits

Chapter: Alternating Current. Topic: Phasor Diagrams, 14 questions over 6 ideas.

All 4 questions

Newest first, each with its options and official answer.

6 Apr 2026, Shift 1 · Q45A LCR series circuit driven with $E_{rms}=90$ V at frequency $f_d=30$ Hz has resistance $R=80\ \Omega$ , an inductance with inductive…EasySingle correct
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