JEE Main PYQs on Alternating Current (AC) Circuits: JEE Main Questions for Practice with Solutions

Updated on - Dec 9, 2025

The JEE Main Physics section requires speed and accuracy, along with a thorough understanding of the Alternating Current (AC) Circuits. This article provides a set of JEE Main PYQs on AC Circuits to help you understand the topic and improve your problem-solving skills with the help of detailed solutions by ensuring conceptual clarity, which will help you in the JEE Main 2026 preparation.

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Whether you're revising the basics or testing your knowledge, these JEE Main PYQs will serve as a valuable practice resource.

The JEE Main 2026 exam is likely to continue on the same pattern as JEE Main 2025. Out of 90 questions, students can expect a fair mix from all three subjects. To get an edge, going through JEE Main previous year questions (PYQs) is one of the best strategies.

JEE Main PYQs on Alternating Current (A.C) Circuits

1. An electric bulb rated as 100 W-220 V is connected to an ac source of rms voltage 220 V. The peak value of current through the bulb is :

A0.64 A

B0.45 A

C2.2 A

D0.32 A

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2. An alternating current is represented by the equation, i = 100√2 sin(100πt) ampere. The RMS value of current and the frequency of the given alternating current are:

A100√2 A, 100 Hz

B100 A, 100 Hz

C100 A, 50 Hz

D50√2 A, 50 Hz

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3. An AC current is represented as: i = 5√2 + 10 cos (650πt + π/6) Amp. The RMS value of the current is:

A50 Amp

B100 Amp

C10 Amp

D5√2 Amp

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4. A series LCR circuit is connected to an alternating source of emf E. The current amplitude at resonance frequency is I₀. If the value of resistance R becomes twice of its initial value, then amplitude of current at resonance will be:

A I₀/2

B 2I₀

C I₀

D I₀/√2

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JEE Main Questions

1.
An alternating voltage source $V =260 \sin (628 t )$ is connected across a pure inductor of $5 mH$ Inductive reactance in the circuit is :
- $3.14 \Omega$
- $6.28 S$
- $0.318 \Omega$
- $0.5 \Omega$
View Solution
2.
An alternating voltage of amplitude 40 V and frequency 4 kHz is applied directly across the capacitor of 12 μF. The maximum displacement current between the plates of the capacitor is nearly:
- 13 A
- 8 A
- 10 A
- 12 A
View Solution
3.
A coil of negligible resistance is connected in series with $90 \, \Omega$ resistor across $120 \, \text{V}, \, 60 \, \text{Hz}$ supply. A voltmeter reads $36 \, \text{V}$ across resistance. Inductance of the coil is:
- $0.76 \, \text{H}$
- $2.86 \, \text{H}$
- $0.286 \, \text{H}$
- $0.91 \, \text{H}$
View Solution
4.
In an ac circuit, the instantaneous current is zero,when the instantaneous voltage is maximum. In this case, the source may be connected to :
A. pure inductor.
B. pure capacitor.
C. pure resistor.
D. combination of an inductor and capacitor.
Choose the correct answer from the options given below :
- A, B and C only
- B, C and D only
- A and B only
- A, B and D only
View Solution
5.
Statement I : In LCR circuit, by increasing frequency current increases first then decreases.
Statement II : Power factor of LCR circuit is one.
Choose the correct option.
- Statement I is correct and statement II is incorrect
- Statement I is incorrect and statement I is correct
- Both Statement I and statement II are correct
- Both Statement I and statement II are incorrect
View Solution
6.
As per the given graph, choose the correct representation for curve A and curve B.

(Where $ X_L = $ reactance of pure inductive circuit connected with A.C. source, $ X_C = $ reactance of pure capacitive circuit connected with A.C. source, $ R = $ impedance of pure resistive circuit connected with A.C. source, and $ Z = $ impedance of the LCR series circuit)
- $ A = X_L, B = R $
- $ A = X_L, B = X_C $
- $ A = X_C, B = R $
- $ A = X_C, B = X_L $
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JEE Main PYQs on AC Circuits: JEE Main Questions for Practice with Solutions

JEE Main PYQs on Alternating Current (A.C) Circuits

JEE Main Questions

1.
An alternating voltage source $V =260 \sin (628 t )$ is connected across a pure inductor of $5 mH$ Inductive reactance in the circuit is :

2.
An alternating voltage of amplitude 40 V and frequency 4 kHz is applied directly across the capacitor of 12 μF. The maximum displacement current between the plates of the capacitor is nearly:

3.
A coil of negligible resistance is connected in series with \(90 \, \Omega\) resistor across \(120 \, \text{V}, \, 60 \, \text{Hz}\) supply. A voltmeter reads \(36 \, \text{V}\) across resistance. Inductance of the coil is:

5.
Statement I : In LCR circuit, by increasing frequency current increases first then decreases.
Statement II : Power factor of LCR circuit is one.
Choose the correct option.

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Structure based on different categories

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JEE Main PYQs on Alternating Current (A.C) Circuits

JEE Main Questions

1.An alternating voltage source $V =260 \sin (628 t )$ is connected across a pure inductor of $5 mH$ Inductive reactance in the circuit is :

2.An alternating voltage of amplitude 40 V and frequency 4 kHz is applied directly across the capacitor of 12 μF. The maximum displacement current between the plates of the capacitor is nearly:

3.A coil of negligible resistance is connected in series with \(90 \, \Omega\) resistor across \(120 \, \text{V}, \, 60 \, \text{Hz}\) supply. A voltmeter reads \(36 \, \text{V}\) across resistance. Inductance of the coil is:

4.In an ac circuit, the instantaneous current is zero,when the instantaneous voltage is maximum. In this case, the source may be connected to :A. pure inductor.B. pure capacitor.C. pure resistor.D. combination of an inductor and capacitor.Choose the correct answer from the options given below :

5.Statement I : In LCR circuit, by increasing frequency current increases first then decreases.Statement II : Power factor of LCR circuit is one.Choose the correct option.

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1.
An alternating voltage source $V =260 \sin (628 t )$ is connected across a pure inductor of $5 mH$ Inductive reactance in the circuit is :

2.
An alternating voltage of amplitude 40 V and frequency 4 kHz is applied directly across the capacitor of 12 μF. The maximum displacement current between the plates of the capacitor is nearly:

3.
A coil of negligible resistance is connected in series with \(90 \, \Omega\) resistor across \(120 \, \text{V}, \, 60 \, \text{Hz}\) supply. A voltmeter reads \(36 \, \text{V}\) across resistance. Inductance of the coil is:

5.
Statement I : In LCR circuit, by increasing frequency current increases first then decreases.
Statement II : Power factor of LCR circuit is one.
Choose the correct option.