Physics · JEE

Reactance and impedance, LCR series circuit, resonance, power in AC circuits, wattless current Previous Year Questions for JEE

21+ syllabus-aligned questions available

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Syllabus context

Part of Electromagnetic Induction and Alternating Currents in JEE Main Physics.

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Q1PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

Ratio of impedance to capacitive reactance has

Q2PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

The power loss in an

A C

circuit is

E_{r m s}

I_{r m s},

when in the circuit there is only

Q3PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

Assertion In series

\boldsymbol{L}-\boldsymbol{C}-\boldsymbol{R} \boldsymbol{A} \boldsymbol{C}

circuit, current and voltage are in same phase at resonance. Reason In series

\boldsymbol{L}-\boldsymbol{C}-\boldsymbol{R} \boldsymbol{A} \boldsymbol{C}

circuit, resonant frequency does not depend on the value of resistance. Hence current, at resonance, does not depend on resistance.

Q4PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

The current flowing through the resistor in a series LCR a.c. circuit, is

\boldsymbol{I}=\varepsilon / \boldsymbol{R}

Now the inductor and capacitor are connected in parallel and joined in series with the resistor as shown in figure. The current in the circuit is now. (Symbols have their usual meaning)

Q5PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

In series LCR circuit

R=18 \Omega

and impedance is

33 \Omega

. An r.m.s. voltage

220 V

is applied across the circuit. The true power consumed in a.c. circuit is

Q6PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

For filtering low frequency noise out of a signal the circuit can be built by just putting resistor and capacitor in

Q7PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

If we change the value of

R

, then

Q8PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

The inductive reactance of a choke coil of

1 / 4 \pi m H

in an

A C

circuit of

50 H z

will be

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Frequently asked questions

Why practise PYQs for Reactance and impedance, LCR series circuit, resonance, power in AC circuits, wattless current?

PYQs reveal recurring concepts, common traps, and the difficulty level JEE expects. Solving them builds exam temperament and time management.

Does Goodmarks have actual JEE past papers?

Our bank includes exam-style MCQs aligned with JEE Main Physics syllabus for Reactance and impedance, LCR series circuit, resonance, power in AC circuits, wattless current, covering the same topics as previous year papers.

How should I use PYQs for Electromagnetic Induction and Alternating Currents?

Solve timed sets, review every explanation, note weak subtopics, then revisit with focused practice on Goodmarks.

Are PYQ solutions step-by-step?

Yes. Every question includes the correct answer and a detailed explanation showing the reasoning.