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Saturday, 31 October

JEE Main · Physics · Alternating Current

Power Factor from Phasors

JEE Main asked Power Factor from Phasors 9 times in 9 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2024 and 2026. It belongs to Phasor Diagrams, in Alternating Current (Physics). The longest wait between two years asking it was 2 years. In 2021, 2022 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
9
in 9 shifts
Years
5 of 8
First asked
2020
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2024 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170.08’200.07’210.07’220’230.14’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 2 in 24 shifts · 2022: 2 in 24 shifts · 2023: 0 in 12 shifts · 2024: 3 in 18 shifts · 2025: 0 in 8 shifts · 2026: 1 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20261 of 9
  • 20250 of 8
  • 20243 of 18
  • 20230 of 12
  • 20222 of 24
  • 20212 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: calculation.

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

Difficulty

Easy 5Medium 4Hard 0

3 of the 9 questions had a numerical answer.

Every question

All 9 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 6 Apr 2026, Shift 1 · Q45A LCR series circuit driven with Erms=90E_{rms}=90 V at frequency fd=30f_d=30 Hz has resistance R=80 ΩR=80\ \Omega, an inductance with inductive…EasySingle correct
  2. 31 Jan 2024, Shift 2 · Q43An AC voltage V=20sin⁡200πtV=20\sin 200\pi t is applied to a series LCR circuit which drives a current I=10sin⁡(200πt+π3)I=10\sin\left(200\pi t+\frac{\pi}{3}\right).…EasySingle correct
  3. 30 Jan 2024, Shift 1 · Q43A series L.R circuit connected with an ac source E=(25sin⁡1000 t)E = (25\sin 1000\,t) V has a power factor of 12\frac{1}{\sqrt{2}}. If the source of emf…MediumSingle correct
  4. 9 Apr 2024, Shift 2 · Q53A capacitor of reactance 43 Ω4\sqrt{3}\ \Omega and a resistor of resistance 4 Ω4\ \Omega are connected in series with an ac source of peak…MediumNumerical value
  5. 30 Jul 2022, Shift 2 · Q12In an A.C circuit , V & I are given by V = 250 sin (100 t) volt and I = 10 sin (100 t + π3\frac{\pi}{3}) A respectively The power…EasySingle correct
  6. 26 Jul 2022, Shift 1 · Q37In a series LR circuit XL=RX_L = R and power factor of the circuit is P1P_1. When capacitor with capacitance C such that XL=XCX_L = X_C is put…EasySingle correct
  7. 18 Mar 2021, Shift 2 · Q13In a series LCR circuit, the inductive reactance (XLX_L) is 10 Ω\Omega and the capacitive reactance (XCX_C) is 4 Ω\Omega. The resistance…EasySingle correct
  8. 27 Aug 2021, Shift 2 · Q22An ac circuit has an inductor and a resistor of resistance R in series, such that XL=3 RX_L=3\ R. Now, a capacitor is added in series such…MediumNumerical value
  9. 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

Shifts: 6 Sep 2020, Shift 2, 18 Mar 2021, Shift 2, 27 Aug 2021, Shift 2, 26 Jul 2022, Shift 1, 30 Jul 2022, Shift 2, 30 Jan 2024, Shift 1, 31 Jan 2024, Shift 2, 9 Apr 2024, Shift 2, 6 Apr 2026, Shift 1.

Same topic

Other ideas in Phasor Diagrams

Phasor Diagrams has 13 ideas JEE Main has asked; 7 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas