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Physics - Alternating Current

Practise 25 JEE Advanced previous year questions on Alternating Current, compiled from papers spanning 2006 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Advanced tests.

Alternating Current has been asked in 15 of the 27 years of JEE Advanced papers analysed (2000–2026), with 25 questions in all. 20% of them were easy, 40% moderate and 40% tough. Most of its questions came from 2006, with 4 questions that year. In the last three years (2024–2026) it had 3 questions across 6 papers, about 0.5 per paper.

The chapter's 4 topics are not weighted equally: AC Circuits (22 questions, 88%), Parallel AC Circuits (1 question, 4%), and Transformers (1 question, 4%) have been asked the most. AC Circuits has also led over the last five years, with 6 questions. AC Circuits has produced the most tough questions (8).

  1. 1Consider a circuit consisting of a capacitor of capacitance and a coil with turns per unit length, cross sectional area and length , where .2026 (Paper 1)AC Circuits
  2. 2A circuit with an electrical load having impedance is connected with an AC source as shown in the diagram. The source voltage varies in time2025 (Paper 1)AC Circuits
  3. 3The circuit shown in the figure contains an inductor , a capacitor , a resistor and an ideal battery. The circuit also contains two keys and2024 (Paper 1)AC Circuits
  4. 4In a circuit shown in the figure, the capacitor C is initially uncharged and the key K is open. In this condition, a current of 1 A flows th2023 (Paper 1)AC Circuits
  5. 5A series LCR circuit is connected to a 45 sin ( t ) Volt source. The resonant angular frequency of the circuit is 10 5 rad s 1 and current a2023 (Paper 1)AC Circuits
  6. 6Consider an LC circuit, with inductance L = 0 . 1 H and capacitance C = 10 - 3 F , kept on a plane. The area of the circuit is 1 m 2 . It is2022 (Paper 1)AC Circuits
  7. 7In a circuit, a metal filament lamp is connected in series with a capacitor of capacitance across a supply. The power consumed by the lamp i2021 (Paper 2)AC Circuits
  8. 8In a circuit, a metal filament lamp is connected in series with a capacitor of capacitance across a supply. The power consumed by the lamp i2021 (Paper 2)AC Circuits
  9. 9In the circuit shown, initially there is no charge on capacitors and keys S 1 and S 2 are open. The values of the capacitors are C 1 = 10 μ 2019 (Paper 1)AC Circuits
  10. 10In the circuit shown, L = 1 μ H , C = 1 μ F a n d R = 1 k Ω . They are connected in series with an a.c. source V = V 0 sin ⁡ ω t as shown. W2017 (Paper 1)AC Circuits
  11. 11The instantaneous voltages at three terminals marked X , Y and Z are given by V X = V 0 sin t V Y = V 0 sin t + 2 3 and V Z = V 0 sin t + 4 2017 (Paper 2)Alternating Current, Voltage and Power
  12. 12Two inductors L i (inductance 1 mH , internal resistance 3 ) and L 2 (inductance 2 mH , internal resistance 4 ), and a resistor R (resistanc2016 (Paper 1)AC Circuits
  13. 13In the circuit shown below, the key is pressed at time t = 0. Which of the following statement(s) is(are) true?2016 (Paper 2)AC Circuits
  14. 14At time t = 0, terminal A in the circuit shown in the figure is connected to B by a key and an alternating current I t = I 0 cos ⁡ ω t , wit2014 (Paper 1)AC Circuits
  15. 15Paragraph: A thermal power plant produces electric power of at , which is to be transported to a place away from the power plant for consume2013 (Paper 2)Transformers
  16. 16In the given circuit, the source has . Considering the inductor and capacitor to be ideal, the correct choice(s) is (are)2012 (Paper 2)Parallel AC Circuits
  17. 17A series - circuit is connected to voltage source. Consider two cases; when is without a dielectric medium and when is filled with dielectri2011 (Paper 2)AC Circuits
  18. 18A series combination is connected to an voltage of angular frequency . If the impedance of the circuit is , the time constant (in millisecon2011 (Paper 2)AC Circuits
  19. 19An AC voltage source of variable angular frequency and fixed amplitude is connected in series with a capacitance and an electric bulb of res2010 (Paper 1)AC Circuits
  20. 20At time , a battery of is connected across points and in the given circuit. If the capacitors have no charge initially, at what time (in sec2010 (Paper 2)AC Circuits
  21. 21You are given many resistances, capacitors and inductors. These are connected to a variable DC voltage source (the first two circuits) or an2010 (Paper 2)AC Circuits
  22. 22Preview not available - open to view this question.2006AC Circuits
  23. 23Paragraph: The capacitor of capacitance can be charged (with the help of a resistance ) by a voltage source , by closing switch while keepin2006AC Circuits
  24. 24Paragraph: The capacitor of capacitance can be charged (with the help of a resistance ) by a voltage source , by closing switch while keepin2006AC Circuits
  25. 25Paragraph: The capacitor of capacitance can be charged (with the help of a resistance ) by a voltage source , by closing switch while keepin2006AC Circuits

Frequently Asked Questions

1.How many questions are available for Alternating Current?

This chapter includes 25 questions compiled from JEE Advanced papers spanning 2006 to 2026.

2.Are these questions only from JEE Advanced, or from other exams too?

These are JEE Advanced questions specifically for the Alternating Current chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Alternating Current an important chapter for JEE Advanced Physics?

Alternating Current has appeared in 15 of the 21 years of JEE Advanced papers covered here, with 25 questions across 18 papers - about one per paper it appears in.

4.What is the difficulty level of Alternating Current questions in JEE Advanced?

Of the 25 questions analysed for this chapter, 20% are easy, 40% moderate and 40% tough. 2006 had the most, with 4 questions.

5.Which topics in Alternating Current should I focus on?

These topics have carried the most weightage in Alternating Current:

  • AC Circuits - 22 questions (88%)
  • Parallel AC Circuits - 1 question (4%)
  • Transformers - 1 question (4%)
  • AC Circuits has produced the most tough questions (8).
6.Is Alternating Current's weightage in JEE Advanced going up or down?

Across all 18 papers analysed, Alternating Current has averaged about 1.4 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.5 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.