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AC Through R, L and C for JEE: 27 solved questions

Real JEE paper questions on ac through r, l and c, part of alternating current. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2005 to 2026. No sign-in needed to read them.

What this topic asks

• Behaviour of R, L and C separately — 13 questions
• Reactance and frequency — 7 questions
• Phase relationships and phasors — 7 questions

All 27 questions with solutions

• An a.c. source of angular frequency ω is connected across a resistor R and a capacitor C in series; the curre… JEE Main 5th April 1st Shift 2026
• In an a.c. circuit the instantaneous current is zero when the instantaneous voltage is maximum. The source ma… JEE Main 4th April 1st Shift 2024
• Match List-I with List-II (phasor diagrams). List-I: (A) Purely capacitive circuit, (B) Purely inductive circ… JEE Main 4th April 2nd Shift 2024
• A bulb and a capacitor are connected in series across an a.c. supply. A dielectric is then inserted between t… JEE Main 9th April 1st Shift 2024
• A capacitor of capacitance 150.0 μF is connected to an alternating emf E=36 sin(120π t) V. The maximum value… JEE Main 6th April 2nd Shift 2023
• From the given graph (see figure), choose the correct representation of curve A and curve B, where X_C is the… JEE Main 11th April 1st Shift 2023
• If R, X_L and X_C are resistance, inductive reactance and capacitive reactance, which of the following is dim… JEE Main 31st Jan 1st Shift 2023
• An alternating source V=260 sin(628t) V is connected across a pure inductor of 5 mH. The inductive reactance… JEE Main 31st Jan 2nd Shift 2023
• The r.m.s. conduction current in a parallel-plate capacitor is 6.9 μA. If it is connected to a 230 V a.c. sup… JEE Main 25th July 2nd Shift 2022
• The current in a purely inductive circuit is 5 sin(49π t-30°) A. If the inductance is 30 mH, the voltage acro… JEE Main 28th July 1st Shift 2022
• An alternating emf E=440 sin(100π t) is applied to a circuit containing an inductance of (√2)/π H. If an a.c.… JEE Main 29th July 1st Shift 2022
• Match List-I with List-II. List-I: (A) ω L>1/(ω C), (B) ω L=1/(ω C), (C) ω L<1/(ω C), (D) resonant frequency.… JEE Main 22nd July 2nd Shift 2021
• A circuit has a capacitor and a generator of emf E_g=E_g0 sin ω t, with V_C and I_C the capacitor voltage and… JEE Main 22nd July 2nd Shift 2021
• An RC circuit (see figure) is driven by an a.c. source generating a square wave. The output waveform seen on… JEE Main 16th March 1st Shift 2021
• Match List-I with List-II. List-I: (A) phase difference between current and voltage in a purely resistive a.c… JEE Main 17th March 2nd Shift 2021
• In a purely inductive circuit, what happens to the inductive reactance and the current if the frequency is ha… JEE Main 17th March 2nd Shift 2021
• An inductance coil has an impedance of 100 Ω. When an a.c. signal of frequency 1000 Hz is applied, the applie… JEE Main 2nd Sept 2nd Shift 2020
• In an LC circuit L=40 mH and C=100 μF. If V(t)=10 sin(314t) V is applied, the current is JEE Main 9th Jan 2nd Shift 2020
• A series LR circuit is connected to a source V(t)=V₀ sin ω t. After a very long time (t₀L/R) the current I(t)… JEE Main Online 2016
• The phase difference between the alternating current and emf is π/2. Which of the following cannot be the con… AIEEE 2005
• An inductor stores 16 J of magnetic energy and dissipates 32 W of thermal power (in its resistance) when an r… JEE Main 28th Jan 2nd Shift 2026
• For the a.c. bridge shown (see figure) with R=100 Ω and C=100 pF, the phase difference between Vᵢₙ and (V_B-V… JEE Main 7th April 1st Shift 2025
• A d.c. voltage of 100 V through an inductor gives 5 A. When an a.c. of peak value 200 V is applied, the induc… JEE Main 6th April 1st Shift 2024
• An alternating emf E=110√2 sin(100t) V is applied to a capacitor of 2 μF. The r.m.s. current in the circuit i… JEE Main 8th April 2nd Shift 2024
• For the network shown (see figure) across 220 V, the effective current I at very high frequencies is A. JEE Main 26th July 1st Shift 2022
• An inductor of 200 mH is connected to a 220 V, 50 Hz a.c. source. The instantaneous source voltage is 0 V whe… JEE Main 24th June 1st Shift 2022
• At very high frequencies the effective impedance of the network shown (see figure, resistors 1 Ω, 2 Ω with ca… JEE Main 31st Aug 2nd Shift 2021