MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction with Answers

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Electromagnetic Induction Class 12 MCQs Questions with Answers

Solving the Electromagnetic Induction Multiple Choice Questions of Class 12 Physics Chapter 6 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Electromagnetic Induction Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 6 Physics Class 12 and cross-check your answers during preparation.

I. Choose the correct answer

Question 1.
A cylindrical bar magnet is rotated about its axis (figure). A wire is connected from the axis and is made to touch the cylindrical surface through a contact. Then
MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction with Answers 1
(a) a direct current flows in the ammeter A.
(b) no current flows through the ammeter A.
(c) an alternating sinusoidal current flows through the ammeter A with a time period T = 2π/ω.
(d) a time varying non-sinusoidal current flows through the ammeter A.

Answer

Answer: (a) a direct current flows in the ammeter A.


Question 2.
There are two coils A and B as shown in figure. A current starts flowing in B as shown, when A is moved towards B and stops when A stops moving. The current in A is counterclockwise. B is kept stationary when A moves. We can infer that
MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction with Answers 2
(a) there is a constant current in the clockwise direction in A.
(b) there is a varying current in A.
(c) there is no current in A.
(d) there is a constant current in the counterclockwise direction in A.

Answer

Answer: (d) there is a constant current in the counterclockwise direction in A.


Question 3.
The self-inductance L of a solenoid of length l and area of cross-section A, with a fixed number of turns N increases as
(a) l and A increase.
(b) l decreases and A increases.
(c) l increases and A decreases.
(d) both l and A decrease.

Answer

Answer: (b) l decreases and A increases.


Question 4.
A metal plate is getting heated. Which one of the following is not the possible cause?
(a) a direct current is passing through the plate.
(b) it is placed in a time-varying magnetic field.
(c) it is placed in a space-varying magnetic field, but does not vary with time.
(d) a current (either direct or alternating) is passing through the plate.

Answer

Answer: (c) it is placed in a space-varying magnetic field, but does not vary with time.


Question 5.
Which of the following will not induce an emf in a coil in the absence of an external voltage source?
(a) the coil being in a time-varying magnetic field.
(b) the coil moving in a time-varying magnetic field.
(c) the coil moving in a constant magnetic field.
(d) the coil is stationary in external spatially varying magnetic field, which does not change with time.

Answer

Answer: (d) the coil is stationary in external spatially varying magnetic field, which does not change with time.


Question 6.
A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil. This can be because
(a) the magnetic field is constant.
(b) the magnetic field is in the same plane as the circular coil and it may or may not vary.
(c) the magnetic field has a perpendicular (to the plane of the coil) component whose magnitude is constant.
(d) there is a constant magnetic field in the perpendicular (to the plane of the coil) direction.

Answer

Answer: (b) the magnetic field is in the same plane as the circular coil and it may or may not vary.


Question 7.
The mutual inductance M12 of coil 1 with respect to coil
(a) decreases when they are brought nearer.
(b) depends on the current passing through the coils.
(c) increases when one of them is rotated about an axis.
(d) is the same as M21 of coil 2 with respect to coil 1.

Answer

Answer: (d) is the same as M21 of coil 2 with respect to coil 1.


Question 8.
Consider a metal ring kept on a horizontal plane. A bar magnet is held above the ring with its length along the central axis of the ring. If the magnet is now dropped freely, the acceleration of the falling magnet is (g is acceleration due to gravity)
MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction with Answers 3
(a) More than g
(b) Equal to g
(c) Less than g
(d) Depends on mass of magnet

Answer

Answer: (c) Less than g


Question 9.
A wheel with ten metallic spokes each 0.50 m long is rotated with a speed of 120 rpm in a place normal to the earth’s magnetic field at the place. If the magnitude of the field is 0.04 G, the induced emf between the axle and the rim of the wheel is equal to
(a) 1.256 × 10-3 V
(b) 6.28 × 10-3 V
(c) 1.256 × 10-4 V
(d) 6.28 × 10-6 V

Answer

Answer: (d) 6.28 × 10-6 V


Question 10.
The coefficient of self-inductance of a solenoid is 0.18 mH. If a rod of soft iron of relative permeability 900 is inserted, then the coefficient of self-inductance will become nearly
(a) 5.4 mH
(b) 162 mH
(c) 0.006 mH
(d) 0.0002 mH

Answer

Answer: (b) 162 mH


II. Fill in the blanks

Question 1.
………………… the magnetic flux can produce an electric current.

Answer

Answer: Changing


Question 2.
Magnetic flux through an area is given by ……………

Answer

Answer: Φ = BA cos θ


Question 3.
……………… is the SI unit of magnetic flux.

Answer

Answer: weber


Question 4.
The magnitude of the induced emf in a circuit is equal to the time rate of change of ……………. through the circuit.

Answer

Answer: Magnetic flux


Question 5.
The statement “The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it” is called ………………. law.

Answer

Answer: Lenz’s


Question 6.
The emf induced in a rod of length / moving with velocity v in a uniform magnetic field B is …………….

Answer

Answer: Blv


Question 7.
Eddy currents are of ……………… nature.

Answer

Answer: Opposing


Question 8.
The induced ……………… does not depend upon the time-interval.

Answer

Answer: Charge


Question 9.
The SI unit of mutual inductance is ……………….

Answer

Answer: henry


Question 10.
Two coils have mutual inductance of 1.5 henry. If the current in the primary circuit is raised by 5 A in one millisecond after closing the circuit, then the induced emf in secondary coil is ……………… volt.

Answer

Answer: 7.5 × 10-3


Question 11.
Two concentric circular coils one of small radius a1 and the other of large radius a2 such that a1 << a2, are placed co-axially with centres coinciding. The mutual inductance of the arrangement is ………………

Answer

Answer: \(\frac { µ_0l_2a_1^2 }{2a_2}\)


Question 12.
Self-inductance of a long solenoid (A, N, l) with core material of magnetic relative permeability µr is (where A = area of each turn, N = number of turns, L = length of solenoid)

Answer

Answer: µ0µrN²A/l


Question 13.
A closed loop moves normal to the constant electric field between the plates of a large capacitor, then no ……………….. is induced in the loop.

Answer

Answer: Current


Question 14.
According to the reciprocity theorem, the mutual inductance of one coil with respect to the other is ……………..

Answer

Answer: M = µ0n1n2πr\(_1^2\) l


Question 15.
Fleming’s right hand rule gives the direction of ………………. current.

Answer

Answer: induced


Question 16.
Metal detector is based on the concept of …………….. currents.

Answer

Answer: Eddy


Question 17.
The energy stored in an inductor is ………………..

Answer

Answer: LI²/2


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