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Electromagnetic Induction JEE physics - Electromagnetic Induction

CBSE - STD 12 Science - JEE physics (CBSE - English Medium). 386 questions in this chapter.

Question types

Electromagnetic Induction question types

386 questions across 2 question groups — pick any mix to generate a JEE physics paper with step-by-step answer keys.

386
Questions
2
Question groups
5
Question types
Sample Questions

Electromagnetic Induction questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1Assertion & Reason1 Mark
Assertion : Faraday's laws are consequences of conservation of energy.
Reason : In a purely resistive ac circuit, the current lags behind the e.m.f. in phase.
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Q 2Assertion & Reason1 Mark
Assertion $\quad:$ The quantity $L / R$ possesses dimensions of time.
Reason : To reduce the rate of increases of current through a solenoid should increase the time constant $(L / R)$.
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Q 3Assertion & Reason1 Mark
Assertion : Only a change in magnetic flux will maintain an induced current the coil.
Reason : The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous.
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Q 4Assertion & Reason1 Mark
Assertion : Eddy currents is produced in any metallic conductor when magnetic flux is changed around it.
Reason : Electric potential determines the flow of charge
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Q 6MCQ1 Mark
A coil of $N=100$ turns carries a current $l=5 \mathrm{~A}$ and creates a magnetic flux $\phi=10^{-5} \mathrm{Tm}^{-2}$ per turn. The value of its inductance $L$ will be
  • A
    $0.05 \mathrm{mH}$
  • B
    $0.10 \mathrm{mH}$
  • C
    $0.15 \mathrm{mH}$
  • ✓
    $0.20 \mathrm{mH}$

Answer: D.

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Q 7MCQ1 Mark
A circular metal plate of radius $R$ is rotating with a uniform angular velocity $\omega$ with its plane perpendicular to a uniform magnetic field $B$. Then the emf developed between the centre and the rim of the plate is
  • A
    $\pi \omega B R^2$
  • B
    $\omega B R^2$
  • C
    $\pi \omega B R^2 / 2$
  • ✓
    $\omega B R^2 / 2$

Answer: D.

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Q 8MCQ1 Mark
A motor having an armature of resistance $2 \Omega$ is designed to operate at $220 V$ mains. At full speed, it develops a back e.m.f. of $210 \mathrm{~V}$. When the motor is running at full speed, the current in the armature is
  • ✓
    $5\ A$
  • B
    $105\ A$
  • C
    $110 \mathrm{~A}$
  • D
    $215\ A$

Answer: A.

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Q 9MCQ1 Mark
When the current through a solenoid increases at a constant rate, the induced current
  • A
    Is constant and is in the direction of the inducing current
  • ✓
    Is a constant and is opposite to the direction of the inducing current
  • C
    Increases with time and is in the direction of the inducing current
  • D
    Increases with time and opposite to the direction of the inducing current

Answer: B.

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Q 10MCQ1 Mark
A magnet is brought towards a coil (i) speedly (ii) slowly then the induced e.m.f./induced charge will be respectively
  • A
    More in first case / More in first case
  • ✓
    More in first case/Equal in both case
  • C
    Less in first case/More in second case
  • D
    Less in first case/Equal in both case

Answer: B.

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