Physics Class 12 MCQ Electromagnetic Induction – Chapter 6

Want to practice all the important MCQs that you may find in your upcoming Board exams, so you are at the right page. Here we have provided you a lot of important Electromagnetic Induction MCQs Physics Class 12. You can scroll down the post and you will find all the important Physics Class 12 MCQs On Electromagnetic Induction with Answers.

Practice these MCQ Questions For Class 12 Physcics Chapter 6 Electromagnetic Induction and make your concepts of the chapter more clear. Physics Class 12 MCQs on Electromagnetic Induction with solutions will give you a hint about what type of objective type questions can be asked in your upcoming Boards.

In this article we have covered almost all the important MCQs on Electromagnetic Induction. Scroll down the page and start practicing these MCQs on Electromagnetic Induction and score really good marks in your Boards.

Physics 12 MCQ of Electrostatic Potential and Capacitance – Chapter 2

Physics 12 Moving Charges and Magnetism MCQ – Chapter 4

Physics Class 12 MCQ Magnetism And Matter – Chapter 5

Physics Class 12 MCQ Electromagnetic Induction – Chapter 6

Ques 1: In the relation ∅ = BA cos θ, θ is angle

  • which normal to surface area makes with the direction of magnetic field
  • which magnetic field makes with the surface
  • which is never constant
  • none of the above

which normal to surface area makes with the direction of magnetic field

Ques 2: The cause of induced e.m.f. is

  • magnetic flux
  • magnetic field
  • area
  • change in magnetic flux

change in magnetic flux

Ques 3: Choose the wrong statemnt:

  • Whenever the amount of magnetic flux linked with a cirucit changes, an e.m.f. is induced in the magnetic flux continues.
  • The induced e.m.f. lasts so long as the change in magnetic flux continues.
  • Larger the amount of magnetic flux linked with a circuit, greater is the e.m.f. induced in it.
  • The direction of induced e.m.f. is given by Lenz’s Law.

Larger the amount of magnetic flux linked with a circuit, greater is the e.m.f. induced in it.

Ques 4: Amount of charge induced in a circuit of resistance R is given by

  • dQ = (d∅)×R
  • dQ = d∅/R
  • dQ = R2d∅
  • dQ = d∅/R2

dQ = d∅/R

Electromagnteic Induction MCQs

Ques 5: Out of the following, choose the correct relation

  • I henry = 1 volt / 1 ampere
  • 1 henry = 1 amp / 1 volt
  • 1 henry = 1 volt / 1 amp/sec
  • 1 henry = 1 volt / 1 amp.sec

1 henry = 1 volt / 1 amp/sec

Ques 6: When number of turns of a solenoid is doubled, its self inductance becomes k times, where k =

  • 2
  • 1
  • 8
  • 4

4

Ques 7: The magnetic flux linked with a coil is ∅ = (3t2 – 2t + 1) milliweber. The e.m.f. induced in the coil at t = 1 sec is

  • 4 V
  • 4 × 10-3 V
  • 6 V
  • 4 × 103 V

4 × 10-3 V

Ques 8: A wire of length 2 m moves with a speed of 5 m/s perpendicular to a magnetic field of induction 0.1 Wb/m2. The e.m.f. induced in the wire is

  • 1 V
  • 10 V
  • 5 V
  • 2 V

1 V

Ques 9: The peak value of alternating e.m.f. in a generator is given by e0 =

  • NAB
  • NAB ω
  • NAB v
  • none of these

NAB ω

Ques 10: The frequency of a.c. generated depends on

  • speed of rotation of coil
  • amplitude of a.c.
  • size of coil
  • all the above

speed of rotation of coil

Ques 11: The form factor of an a.c. generator is given by

  • Iav / I0
  • I0 / Iav
  • Iav / Iv
  • Iv / Iav

Iv / Iav

Ques 12: In which of the following appliances, Fleming’s right hand rule for direction of induced current is not applicable?

  • a.c. generator
  • d.c. generator
  • induction motor
  • transformer

transformer

Ques 13: Due to relative motion of a magnet with respect to a coil, an e.m.f. is induced in the coil, identify the principle involved

  • Ampere’s circuital law
  • Faraday’s law
  • Gauss law
  • Biot-Savart law

Faraday’s law

Ques 14: In Faraday’s experiment on electromagnetic induction, more deflection will be shown by galvanometer, when

  • Magnet is in uniform motion towards the coil
  • Magnet is uniform motion away from the coil
  • Magnet is in accelerated motion towards the coil
  • Magnet is at rest near the coil

Magnet is in accelerated motion towards the coil

Electromagnetic Induction MCQs Questions With Solutions

Ques 15: If both, the number of turns and core length of an inductor are doubled keeping other factors constant, then its self-inductance will be

  • unaffected
  • doubled
  • halved
  • quadrupled

doubled

Ques 16: Oscillating metallic pendulum in a uniform magnetic field directed perpendicular to the plane of oscillation

  • slows down
  • becomes faster
  • remains unaffected
  • oscillates with changing frequency

slows down

Ques 17: A metallic cylinder is held vertically and then a small magnet is dropped along its axis. It will fall with

  • acceleration a > g
  • acceleration a < g
  • acceleration a = g
  • constant velocity a = 0

acceleration a < g

Ques 18: An e.m.f. of 200 V is induced in a circuit when current in the circuit falls from 5 A to 0 A in 0.1 second. The self-inductance of the cirucit is

  • 3.5 H
  • 3.9 H
  • 4 H
  • 4.2

4 H

Ques 19: The magnetic flux linked with a coil at any instant t is ∅ = <6t2 – 8 t + 5) Wb, the e.m.f. induced in the coil at t = 2 second is

  • -16 V
  • – 24 V
  • + 24 V
  • + 16 V

-16 V

Ques 20: A conducting circular ring is placed in a uniform magnetic field B with its plane perpendicular to the field. The radius of the ring starts shrinking at the rate (da/dt). Then induced e.m.f. at the instant when the radius is a is

  • (π a2/2)sup>2 B (dt/dt)
  • π a B (da/dt)
  • π a2 (dB/dt)
  • 2 π a B (da/dt)

2 π a B (da/dt)

Ques 21: A small piece of metal wire is dragged across the gap between the poles of a magnet in 0.4 s. If change in magnetic flux in the wire is 8 × 10-4 Wb, then e.m.f. induced in the wire is

  • 8 × 10-3 V
  • 6 × 10-3 V
  • 4 × 10-3 V
  • 2 × 10-3

2 × 10-3

Ques 22: If the no. of turns per unit length of the coil of a solenoid is doubled keeping other dimensions same, then its self-inductance will be

  • halved
  • doubled
  • four times
  • eight times

four times

Ques 23: The energy stored in coil carrying current I us U. If current is halved, then energy in the coil will be

  • U/2
  • U/4
  • 2 U
  • 4 U

U/4

MCQs On Electromagnetic Induction Class 12

Ques 24: A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. A magnetic induction B constant in time and space, pointing perpendicular and into the plane of the loop exists everywhere. The current induced in the loop is

  • Blv / R clockwise
  • Blv / R anticlockwise
  • 2 Blv / R anticlockwise
  • 2l/3

2l/3

Ques 25: A conducting square loop of side l and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. A magnetic induction B constant in time and space, pointing perpendicular and into the plane at the loop exists everywhere with halt the loop outside the field, as shown in the induced e.m.f. is

  • Zero
  • R v B
  • VB l/R
  • VB l

VB l

Ques 26: A wheel with ten metallic spokes each 0.50 m long is rotated with a speed of 129 rev/min in a plane normal to the earth’s magnetic field at the place. If the magnitude of the field at the place. If the magnitude of the field is 0.4 Gauss, the induced e.m.f. between the axle and the rim of the wheel is equal to

  • 1.256 × 10-3 V
  • 6.28 × 10-4 V
  • 1.256 × 10-4 V
  • 6.28 × 10-5 V

6.28 × 10-5 V

Ques 27: In a circuit with a coil of resistance 2 ohms, the magnetic flux changes from 2.0 Wb to 10.0 to 10.0 Wb in 0.2 second. The charge that flows in the coil during this time is

  • 5.0 coulomb
  • 4.0 coulomb
  • 1.0 coulomb
  • 0.8 coublomb

4.0 coulomb

Ques 28: The direction of induced current is such that it opposes the very cause that has produced it. This is the law of

  • Lenz
  • Faraday
  • Kirchhoff
  • Fleming

Lenz

Ques 29: The magnetic flux through a circuit of resistance R changes by an amount ∆∅ in time ∆t. Then the total quantity of electric charge Q, which passes during this time through any point of the circuit is given by

  • Q = ∆∅ / ∆t
  • Q = ∆∅ / ∆t × R
  • Q = – ∆∅ / ∆r + R
  • Q = ∆∅ / R

Q = ∆∅ / R

Ques 30: A coil having an area A0 is placed in a magnetic field which changes from B0 to 4 B0 in a time interval t. Them e.m.f. induced in the coil will be

  • 3 A0 B0 / t
  • 4 A0 B0 / t
  • 3 B0 / A0 t/li>
  • 4 B0 / A0 t

3 A0 B0 / t

Physics Class 12 MCQ Electrostatic Charges and Fields – Chapter 1

Physics Chapter Wise MCQ Questions and Answers

  1. Electrostatic Charges and Fields MCQ – Chapter 1
  2. Electrostatic Potential and Capacitance MCQ – Chapter 2
  3. Current Electricity MCQ Question Answer – Chapter 3
  4. Moving Charges and Magnetism MCQ – Chapter 4
  5. Magnetism And Matter MCQ – Chapter 5
  6. Electromagnetic Induction MCQ – Chapter 6
  7. MCQ Alternating Current MCQ – Chapter 7
  8. Electromagnetic Waves MCQ – Chapter 8
  9. Ray Optics And Optical Instruments MCQ – Chapter 9
  10. MCQ Wave Optics MCQ – Chapter 10
  11. Dual Nature of Radiation and Matter MCQ – Chapter 11
  12. Atoms MCQ – Chapter 12

physics 12 mcq

We hope that you will practice these questions from Electromagnetic Induction and will make your concepts of the chapter more strong. In case you want to clear your doubts regarding something, you may notify us via comment section.

Updated: October 17, 2021 — 11:56 am

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