Alternating Current JEE Main PYQs PDF, 2020–2026

Alternating Current has 136 questions in JEE Main papers from 2020 to 2026, about 19 per year across all shifts. The free PDF has 133 of them, each with its answer. The most asked topic is Resonance and Q-Factor (37 questions), followed by AC Circuits: R, L, C (33) and Power in AC Circuits (23).

Asked in JEE Main: 1362020–2026, all shifts
In this free PDF: 133with answers
Asked in 2026: 10Latest paper: 2026 Apr S1
Most asked topic: Resonance and Q-Factor37 Qs · 27% of the chapter
Difficulty mix: 61% easy · 39% mediumof the questions in the PDF

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Source: official NTA JEE Main papers · Updated 25 Oct 2026

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10 of this chapter's questions came back in a later paper (2021–2026). See the most repeated.

How often it's asked in JEE Main

Alternating Current had about 0.8 questions per shift in recent JEE Main papers (2024–26). Most asked topic in 2024–26: Power in AC Circuits. About 10 questions in the 2026 papers. (Some topics were cut in 2024; see what changed.)

It came up in most 2024–26 shifts in our bank (about 37 shifts). Question types in 2020–2026: about 83 MCQs and about 53 numerical.

How many questions from Alternating Current in JEE Main, year by year

Year	Questions	Per shift	MCQ	Numerical
2026	10	0.5	6	4
2025	10	0.5	6	4
2024	25	1.3	16	9
2023	22	0.9	12	10
2022	31	1.3	18	13
2021	32	1.2	20	12
2020	6	0.4	5	1
2020–2026	136	0.9	83	53

Most asked Alternating Current topics, 2020–2026

Topic	Questions
Resonance and Q-Factor	37
AC Circuits: R, L, C	33
Power in AC Circuits	23
Series RLC Circuit	17
AC Voltage and Current	14

Every topic, year by year, is in the topic-wise table further down.

Counted from PrepWiser's question bank of JEE Main papers, 2020–2026. Per shift = questions that year ÷ shifts in our bank. Updated 25 Oct 2026.

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Two free sheets, made from the past JEE Main questions on this chapter.

Revision notes10 pages, 21 ideas with the usual mistakes.Open the revision notes Formula sheet2 pages, all 19 formulas.Open the formula sheet

Alternating Current questions per year

Year	Asked	In PDF
2026	10	10
2025	10	10
2024	25	24
2023	22	21
2022	31	30
2021	32	32
2020	6	6

in the free PDF asked, not in the PDFThe PDF only has questions we can print in full with a checked answer, so it holds 133 of the 136 asked.

Topic-wise weightage by year

How many Alternating Current questions each topic had in every JEE Main year (all shifts), counting every question asked, including ones not in the PDF. Darker cells mean more questions.

Topic	Asked	Share	2026	2025	2024	2023	2022	2021	2020
Resonance and Q-Factor	37	27%	·	2	4	12	8	10	1
AC Circuits: R, L, C	33	24%	·	3	8	3	10	6	3
Power in AC Circuits	23	17%	10	1	4	2	3	2	1
Series RLC Circuit	17	13%	·	·	2	3	5	6	1
AC Voltage and Current	14	10%	·	4	2	1	2	5	·
Transformers	9	7%	·	·	4	1	2	2	·
Phasors and Impedance	3	2%	·	·	1	·	1	1	·
All topics	136	100%	10	10	25	22	31	32	6

Swipe the table sideways for older years.

Newest questions (2026)

All 10 JEE Main 2026 Alternating Current questions in the free PDF, latest shift first.

JEE Main 2026 · 6 Apr · Shift 1 · Power in AC Circuits

A LCR series circuit driven with $E_{{rms}}=90{\ \mathrm{V}}$ at frequency $f_{{{\mathrm{d}}}}=30{\ \mathrm{Hz}}$ has resistance $R=80\Omega$ , an inductance with inductive reactance $X_{L}=20.0\Omega$ and capacitance with capacitive reactance $X_{C}=80.0\Omega$ . The power factor of the circuit is $\_\_\_\_$ .

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JEE Main 2026 · 5 Apr · Shift 2 · Power in AC Circuits

A series LCR circuit with $R=20\Omega,L=1.6{\mathrm{H}}$ and $C=40\mu{\ \mathrm{F}}$ is connected to a variable frequency a.c. source. The inductive reactance at resonant frequency is $\_\_\_\_$ $\Omega$ .
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JEE Main 2026 · 5 Apr · Shift 1 · Power in AC Circuits

An a.c. source of angular frequency $\omega$ is connected across a resistor $R$ and a capacitor $C$ in series. The current is observed as $I$ . Now the frequency of the source is changed to $\omega/4$ , (keeping the voltage unchanged) the current is found to be $I/3$ . The ratio of resistance to reactance at frequency $\omega$ is

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JEE Main 2026 · 4 Apr · Shift 1 · Power in AC Circuits

An inductor of 10 mH , capacitor of $0.1\mu{\ \mathrm{F}}$ and a resistor of $100\Omega$ are connected in series across an $a.c$ power supply $220{\ \mathrm{V}},70{\ \mathrm{Hz}}$ . The power factor of the given circuit is 0.5 . The difference in the inductive reactance and capacitance reactance is $\sqrt{3}\alpha\Omega$ . The value of $\alpha$ is $\_\_\_\_$ .
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JEE Main 2026 · 2 Apr · Shift 2 · Power in AC Circuits

The figure given below shows an LCR series circuit with two switches S₁ and S₂. When switch S₁ is closed keeping S₂ open, the phase difference (φ) between the current and source voltage is 30° and phase difference is 60° when S₂ is closed keeping S₁ open. The value of (3L₁ − L₂) is ______ H.
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JEE Main 2026 · 28 Jan · Shift 1 · Power in AC Circuits

The electric current in the circuit is given as $i=i_{{{\mathrm{o}}}}(t/T)$ . The r.m.s current for the period $t=0$ to $t=T$ is $\_\_\_\_$ .
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JEE Main 2026 · 28 Jan · Shift 2 · Power in AC Circuits

An inductor stores 16 J of magnetic field energy and dissipates 32 W of thermal energy due to its resistance when an a.c. current of 2 A (rms) and frequency 50 Hz flows through it. The ratio of inductive reactance to its resistance is ______. ( $\pi=3.14$ )
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JEE Main 2026 · 24 Jan · Shift 1 · Power in AC Circuits

For the series LCR circuit connected with $220{\ \mathrm{V}},50{\ \mathrm{Hz}}$ a.c source as shown in the figure, the power factor is $\frac{\alpha}{10}$ . The value of $\alpha$ is $\_\_\_\_$ .

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JEE Main 2026 · 23 Jan · Shift 1 · Power in AC Circuits

Using a variable frequency a.c. voltage source the maximum current measured in the given LCR circuit is 50 mA for $V=5\sin (100t)$ The values of $L$ and $R$ are shown in the figure. The capacitance of the capacitor ( C ) used is $\_\_\_\_$ $\mu{\mathrm{F}}$ .

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JEE Main 2026 · 21 Jan · Shift 2 · Power in AC Circuits

A capacitor C is first charged fully with potential difference of $V_{0}$ and disconnected from the battery. The charged capacitor is connected across an inductor having inductance L. In $t$ s, 25% of the initial energy in the capacitor is transferred to the inductor. The value of $t$ is ________ s.
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Sample questions from recent papers

JEE Main 2025 · 7 Apr · Shift 1 · AC Circuits: R, L, C

For ac circuit shown in figure, $\mathrm{R}=100 \mathrm{k} \Omega$ and $\mathrm{C}=100 \mathrm{pF}$ and the phase difference between $\mathrm{V}_{\text {in }}$ and $\left(\mathrm{V}_{\mathrm{B}}-\mathrm{V}_{\mathrm{A}}\right)$ is $90^{\circ}$ . The input signal frequency is $10^x \mathrm{rad} / \mathrm{sec}$ , where ' $x$ ' is __________ .

JEE Main PYQ figure

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Answer: 5

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JEE Main 2025 · 7 Apr · Shift 1 · AC Voltage and Current

An ac current is represented as

$i=5 \sqrt{2}+10 \cos \left(650 \pi t+\frac{\pi}{6}\right) A m p$

The r.m.s value of the current is

(A) 10 Amp
(B) $5 \sqrt{2} \mathrm{~Amp}$
(C) 100 Amp
(D) 50 Amp

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Answer: (A)

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JEE Main 2025 · 23 Jan · Shift 2 · Resonance and Q-Factor

In a series LCR circuit, a resistor of $300 \Omega$ , a capacitor of 25 nF and an inductor of 100 mH are used. For maximum current in the circuit, the angular frequency of the ac source is _________ $\times 10^4$ radians $\mathrm{s}^{-1}$

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Answer: 2

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JEE Main 2024 · 5 Apr · Shift 1 · Series RLC Circuit

An ac source is connected in given series LCR circuit. The rms potential difference across the capacitor of $20 \mu \mathrm{F}$ is __________ V.

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Answer: 50

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JEE Main 2024 · 1 Feb · Shift 2 · Transformers

A transformer has an efficiency of

80 \%

and works at

10 \mathrm{~V}

and

4 \mathrm{~kW}

. If the secondary voltage is

240 \mathrm{~V}

, then the current in the secondary coil is :

(A) $1.33 \mathrm{~A}$
(B) $13.33 \mathrm{~A}$
(C) $1.59 \mathrm{~A}$
(D) $15.1 \mathrm{~A}$

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Answer: (B)

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JEE Main 2024 · 30 Jan · Shift 1 · Phasors and Impedance

A series L.R circuit connected with an ac source $E=(25 \sin 1000 t) V$ has a power factor of $\frac{1}{\sqrt{2}}$ . If the source of emf is changed to $\mathrm{E}=(20 \sin 2000 \mathrm{t}) \mathrm{V}$ , the new power factor of the circuit will be :

(A) $\frac{1}{\sqrt{3}}$
(B) $\frac{1}{\sqrt{2}}$
(C) $\frac{1}{\sqrt{5}}$
(D) $\frac{1}{\sqrt{7}}$

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Answer: (C)

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Frequently asked

How many questions come from Alternating Current in JEE Main?

136 questions from 2020 to 2026, about 19 per year. In 2026 it had 10. The free PDF has 133 of them.

Which Alternating Current topics are most important for JEE Main?

By past papers: Resonance and Q-Factor (27%), AC Circuits: R, L, C (24%) and Power in AC Circuits (17%) of all Alternating Current questions.

Is the Alternating Current PYQ PDF free?

Yes. The PDF and its answer key are free, and you can practise the questions online with no login, with step-by-step solutions where available.

Prefer to solve online? Practise Alternating Current online with step-by-step solutions where available, or work through JEE Main papers shift by shift.

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JEE Main PYQs by year: 2026 · 2025 · 2024 · 2023 · 2022 · 2021 · 2020

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Answers follow NTA's final answer keys. Typing errors are possible, so check doubtful answers against the official key. Spotted a mistake? prepwiser.in/feedback · Terms: prepwiser.in/terms

Alternating Current JEE Main PYQs PDF, 2020–2026

How often it's asked in JEE Main

How many questions from Alternating Current in JEE Main, year by year

Most asked Alternating Current topics, 2020–2026

Revise Alternating Current before you practise

Send this chapter to your study group

Alternating Current questions per year

Topic-wise weightage by year

Newest questions (2026)

Sample questions from recent papers

Practise these online, free, no login

Frequently asked

How many questions come from Alternating Current in JEE Main?

Which Alternating Current topics are most important for JEE Main?

Is the Alternating Current PYQ PDF free?

More Physics chapters