# MCQ Chapter 6 Electromagnetic Induction Class 12 Physics

Please refer to Electromagnetic Induction MCQ Questions Class 12 Physics below. These MCQ questions for Class 12 Physics with answers have been designed as per the latest NCERT, CBSE books, and syllabus issued for the current academic year. These objective questions for Electromagnetic Induction will help you to prepare for the exams and get more marks.

## Electromagnetic Induction MCQ Questions Class 12 Physics

Please see solved MCQ Questions for Electromagnetic Induction in Class 12 Physics. All questions and answers have been prepared by expert faculty of standard 12 based on the latest examination guidelines.

### MCQ Questions Class 12 Physics Electromagnetic Induction

Question. The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a short galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was
(a) moving towards the solenoid
(b) moving into the solenoid
(c) at rest inside the solenoid
(d) moving out of the solenoid

D

Question. The magnetic flux linked with a coil of N turns of area of cross section A held with its plane parallel to the field B is
(a) NAB/2
(b) NAB
(c) NAB/4
(d) zero

D

Question. Faraday’s laws are consequence of the conservation of
(a) charge
(b) energy
(c) magnetic field
(d) both (b) and (c)

B

Question. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in
(a) P increases while in Q decreases
(b) Q increases while in P decreases
(c) both P and Q increases
(d) both P and Q decreases

D

Question. Direction of current induced in a wire moving in a magnetic field is found using
(a) Fleming’s left hand rule
(b) Fleming’s right hand rule
(c) Ampere’s rule
(d) Right hand clasp rule

B

Question. Lenz’s law is a consequence of the law of conservation of
(a) charge
(b) energy
(c) induced emf
(d) induced current

B

Question. A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, the current will
(a) increase
(b) decrease
(c) remain same
(d) first increase then decrease

B

Question. Which of the following statements is not correct?
(a) Whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in circuit.
(b) The induced emf lasts so long as the change in magnetic flux continues.
(c) The direction of induced emf is given by Lenz’s law.
(d) Lenz’s law is a consequence of the law of conservation of momentum.

D

Question. There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then
(a) current is induced in the loop in the anticlockwise direction.
(b) current is induced in the loop in the clockwise direction.
(c) ac is induced in the loop.
(d) no current is induced in the loop.

A

Question. In the given figure current from A to B in the straight wire is decreasing. The direction of induced current in the loop is

(a) clockwise
(b) anticlockwise
(c) changing
(d) nothing can be said

B

Question. The north pole of a bar magnet is rapidly introduced into a solenoid at one end (say A). Which of the following statements correctly depicts the phenomenon taking place?
(a) No induced emf is developed.
(b) The end A of the solenoid behaves like a south pole.
(c) The end A of the solenoid behaves like north pole.
(d) The end A of the solenoid acquires positive potential.

C

Question. A metal plate can be heated by
(a) passing either a direct or alternating current through the plate.
(b) placing in a time varying magnetic field.
(c) placing in a space varying magnetic field, but does not vary with time.
(d) both (a) and (b) are correct.

D

Question. Identify the wrong statement.
(a) Eddy currents are produced in a steady magnetic field.
(b) Eddy currents can be minimized by using laminated core.
(c) Induction furnace uses eddy current to produce heat.
(d) Eddy current can be used to produce braking force in moving trains.

A

Question. Which of the following does not use the application of eddy current?
(a) Electric power meters
(b) Induction furnace
(c) LED lights
(d) Magnetic brakes in trains

C

Question. If number of turns in primary and secondary coils is increased to two times each, the mutual inductance
(a) becomes 4 times
(b) becomes 2 times
(c) becomes 1/4 times
(d) remains unchanged

A

Question. When the rate of change of current is unity, the induced emf is equal to
(a) thickness of coil
(b) number of turns in coil
(c) coefficient of self inductance
(d) total flux linked with coil

C

Question. Two inductors of inductance L each are connected in series with opposite magnetic fluxes. The resultant inductance is (Ignore mutual inductance)
(a) zero
(b) L
(c) 2L
(d) 3L

C

Read the two statement Assertion (A) and Reason (R) carefully to mark the correct option out of the options given below:
(a) Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.
(b) Assertion and Reason both are correct statements but Reason is not correct explanation for Assertion.
(c) Assertion is correct statement but Reason is wrong statement.
(d) Assertion is wrong statement but Reason is correct statement.

Question. Assertion: When two coil are wound on each other, the mutual induction between the coils is maximum.
Reason: Mutual induced does not depend on the orientation of the coils.

C

Question. Assertion: An induced emf is generated when magnet is withdrawn from the solenoid.
Reason: The relative motion between magnet and solenoid induces emf

A

Question. Assertion: A copper sheet is placed in a magnetic field. If we pull it out of the field or push it into the field, we experience an opposing force.
Reason: According to Lenz’s law, eddy current produced in sheet opposes the motion of the sheet.

A

Question. Assertion: Induced emf depends on number of turns and area of the coil.
Reason: Induced emf increase with increase in number of turns of coil.

B

Question. Assertion: Self-inductance is called the inertia of electricity.
Reason: Self-inductance is the phenomenon, according to which an opposing induced emf is produced in a coil as a result of change in current or magnetic flux linked with the coil.

A

Question. Assertion: The coil in the resistance boxes are made by doubling the wire.
Reason: Thick wire is required in resistance box.

C

Question. Assertion: Acceleration of a magnet falling through a copper ring decreases.
Reason: The induced current produced in a circuit always flow in such direction that it opposes the change or cause that produced it.

A

Question. Assertion: An aircraft flies along the meridian, the potential develops at the ends of its wings is same.
Reason: Whenever there is change in the magnetic flux emf induces.

D

Question. Assertion: An induced current is developed when the number of magnetic lines of force associated with conductor is changed.
Reason: An induced current develop in a conductor moved in a direction parallel to the magnetic field.

C

Question. Assertion: Changing magnetic flux can produce induced emf.
Reason: Faraday established induced emf experimentally.