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Electromagnetic Induction MCQs | Electromagnetic Induction Multiple Choice Questions and Answers

Questions
1 The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as
A self-inductance
B mutual inductance
C series aiding inductance
D capacitance

Answer: self-inductance
2 The inductance of a coil will increase under all the following conditions except
A when more length for the same number of turns is provided
B when the number of turns of the coil increase
C when more area for each turn is provided
D when permeability of the core increases

Answer: when more length for the same number of turns is provided
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3 Higher the self-inductance of a coil,
A lesser its weber-turns
B lower the e.m.f. induced
C greater the flux produced by it
D longer the delay in establishing steady current through it

Answer: longer the delay in establishing steady current through it
4 Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
A unaffected
B doubled
C halved
D None of the above

Answer: doubled
5 The direction of induced e.m.f. can be found by
A Laplace’s law
B Lenz’s law
C Fleming’s right hand rule
D All of the above

Answer: Lenz’s law
6 The magnitude of the induced e.m.f. in a conductor depends on the
A flux density of the magnetic field
B amount of flux cut
C amount of flux linkages
D rate of change of flux-linkages

Answer: rate of change of flux-linkages
7 The law that the induced e.m.f. and current always oppose the cause producing them is due to
A Faraday
B Lenz
C Newton
D None Of The Above

Answer: Lenz
8 Which of the following circuit elements will oppose the change in circuit current ?
A Capacitance
B Inductance
C Resistance
D None of these

Answer: Inductance
9 For a purely inductive circuit which of the following is true ?
A Apparent power is zero
B Relative power is.zero
C Actual power of the circuit is zero
D None of the Above

Answer: Actual power of the circuit is zero
10 The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be
A 3 mH
B 12 mH
C 24mH
D None Of The Above

Answer: 3 mH
11 Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be
A 32 mH
B 38 mH
C 40 mH
D None of the Above

Answer: 38 mH
12 A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
A 50 ohms
B 500 ohms
C 5000 ohms
D None of the above

Answer: 5000 ohms
13 The co-efficient of coupling between two air core coils depends on
A self-inductance of two coils only
B mutual inductance between two coils only
C mutual inductance and self inductance of two coils
D none of the above

Answer: mutual inductance and self inductance of two coils
14 Which of the fpllowing inductor will have the least eddy current losses ?
A Air core
B Laminated iron core
C Iron core
D All of the above

Answer: Air core
15 Which circuit element(s) will oppose the change in circuit current ?
A Resistance only
B Inductance only
C Capacitance only
D None of these

Answer: Inductance only
16 A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
A variation in coil current
B variation in voltage to the coil
C change of number of turns of coil
D None of the above

Answer: variation in voltage to the coil
17 An E.M.F. can be induced by _________
A Change in the magnetic field only
B Change in the area of cross section only
C Change in angle between magnetic field and area only
D Change in the magnetic field, area or angle between them

Answer: Change in the magnetic field, area or angle between them
18 The total number of magnetic field lines passing through an area is termed as?
A Voltage
B EMF
C Magnetic flux
D None of the above

Answer: Magnetic flux
19 If a conductor 0.2m long moves with a velocity of 0.3m/s in a magnetic field of 5T, calculate the emf induced if magnetic field, velocity and length of conductor are mutually perpendicular to each other.
A 0.3V
B 0.03V
C 30V
D None of the above

Answer: 0.3V
20 What does emf stand for?
A Electronic magnetic force
B Electromotive force
C Electromagnetic force
D None Of The Above

Answer: Electromotive force

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