Learn

Saturday, 10 October

JEE Main 2025 · PhysicsNumerical answerNumerical valueHardMulti-step

JEE Main 7 April 2025, Shift 1, Physics Q49

Question 49 of 75 in this shift, Physics question 24 of 25, Section B.

For ac circuit shown in figure, R = 100 kΩ\Omega and C = 100 pF and the phase difference between Vin\mathrm{V_{in}} and (VB−VA)(\mathrm{V_B} - \mathrm{V_A}) is 90∘90^\circ. The input signal frequency is 10x10^x rad/sec, where 'x' is ______.

The figure, in words

Bridge circuit driven by source V_in: left arm is R in series with C (to the bottom wire), right arm is C in series with R; V_A is taken at the junction of R and C in the left arm and V_B at the junction of C and R in the right arm.

Official answer

5

NTA final key.

Chapter
Alternating Current
Topic
Phasor Diagrams
Idea tested
Phase Shifting Networks

Same topic in other shifts

All Phasor Diagrams questions
  1. 2 Apr 2026, Shift 2 · Q42The figure given below shows an LCR series circuit with two switches S1S_1 and S2S_2. When switch S1S_1 is closed keeping S2S_2 open, the…HardSingle correctHas a figure
  2. 4 Apr 2026, Shift 1 · Q50An inductor of 1010 mH, capacitor of 0.1 μ0.1\ \muF and a resistor of 100 Ω100\ \Omega are connected in series across an a.ca.c power supply…MediumNumerical value
  3. 5 Apr 2026, Shift 1 · Q44An a.c. source of angular frequency ω\omega is connected across a resistor RR and a capacitor CC in series. The current is observed as…MediumSingle correct
  4. 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
  5. 4 Apr 2025, Shift 2 · Q48An inductor of self inductance 1 H is connected in series with a resistor of 100 π100\,\pi ohm and an ac supply of 100 π100\,\pi volt, 50 Hz.…MediumNumerical value
  6. 9 Apr 2024, Shift 1 · Q43A bulb and a capacitor are connected in series across an ac supply. A dielectric is then placed between the plates of the capacitor. The…MediumSingle correct

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.