# Physics Class 12 MCQ Electromagnetic Induction – Chapter 6

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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.

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## 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.

• 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

• 2
• 1
• 8
• 4

4

• 4 V
• 4 × 10-3 V
• 6 V
• 4 × 103 V

4 × 10-3 V

• 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

• 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
• Gauss law
• Biot-Savart 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

• unaffected
• doubled
• halved

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

• 3.5 H
• 3.9 H
• 4 H
• 4.2

4 H

• -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)

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

2 × 10-3

• halved
• doubled
• four times
• eight times

four times

• 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

• 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

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

4.0 coulomb

• Lenz
• 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

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Updated: January 3, 2022 — 8:40 am
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