Physics · JEE

Important Questions: Alternating currents, peak and RMS value of alternating current/voltage for JEE

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The most important Alternating currents, peak and RMS value of alternating current/voltage questions for JEE cover conceptual traps, standard results, and numerical patterns from Alternating currents, peak and RMS value of alternating current/voltage. Goodmarks provides 16+ high-yield MCQs with full solutions.

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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

Choose the incorrect statement.

Q2PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

An alternating voltage given as

\boldsymbol{V}=

\mathbf{1 0 0} \sqrt{\mathbf{2}} \sin 100 t \quad

is applied to a capacitor of

1 \mu F

. The current reading of the ammeter will be equal to

\mathrm{mA}

Q3PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

The average half-cycle value of a sine wave with a

40 V

peak is

Q4PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

A sinusoidal voltage

V=200 \sin 314 t

is applied to a

10 \Omega

resistor. Find rms current

Q5PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

An LC circuit has

L=5 \mathrm{mH}

and

C=20 \mu \mathrm{F}

\boldsymbol{v}=\mathbf{5} \times \mathbf{1 0}^{-\mathbf{3}}

coswt is supplied. is twice the resonant frequency. Find the maximum charge stored in the capacitor:

Q6PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

In an a.c. circuit

\mathrm{V}

and I are given by

V=50 \sin 50 t

volt and

I=

100 \sin (50 t+\pi / 3) \mathrm{mA} .

The power dissipated in the circuit

Q7PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

In a circuit the coil of a choke:

Q8PhysicsUnit 14: Electromagnetic Induction and Alternating Currents

The figure given shows the variation of an alternating emf with time. What is the average value of the emf for the shaded part of the graph?

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Important questions test core concepts that appear frequently across JEE Main and Advanced papers — definitions, standard formulas, and classic problem types.

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Key areas include Alternating currents, peak and RMS value of alternating current/voltage. Prioritise these before moving to edge cases.

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