Top 50+ Solved Electromagnetic Induction MCQ Questions Answer

Q. Which of the following is not a unit of inductance ?

a. Henry

b. Coulomb/volt ampere

c. Volt second per ampere

d. All of the above

Q. In case of an inductance, current is proportional to

a. voltage across the inductance

b. magnetic field

c. both (a) and (b)

d. neither (a) nor (b)

Q. Which of the following circuit elements will oppose the change in circuit current ?

a. Capacitance

b. Inductance

c. Resistance

d. All of the above

Q. 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. Any capacitance even if present in the circuit will not be charged

Q. Which of the following is unit of inductance ?

a. Ohm

b. Henry

c. Ampere turns

d. Webers/metre

Q. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of currentmust be

a. 64 A/s

b. 32 A/s

c. 16 A/s

d. 4 A/s

Q. The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the corelength is doubled, all other quantities, remaining the same, the in ductance will be

a. 3 mH

b. 12 mH

c. 24mH

d. 48mH

Q. The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is0.5, the mutual inductance of the coils is

a. 4 mH

b. 5 mH

c. 6 mH

d. 12 mH

Q. Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. Ifthe two coils are connected in series aiding, the total inductance will be

a. 32 mH

b. 38 mH

c. 40 mH

d. 48 mH

Q. A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400turns, all other quantities (area, length etc.) remaining the same, the inductance will be

a. 6 mH

b. 14 mH

c. 24 mH

d. 48 mH

Q. Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. Ifthe two coils are connected in series, the total inductance will be

a. 6 H

b. 8 H

c. 12 H

d. 24 H

Q. In case all the flux from the current in coil 1 links with coil 2, the co-efficient of couplingwill be

a. 2.0

b. 1.0

c. 0.5

d. zero

Q. A coil with negligible resistance has 50V across it with 10 mA. The inductive reactanceis

a. 50 ohms

b. 500 ohms

c. 1000 ohms

d. 5000 ohms

Q. A conductor 2 metres long moves at right angles to a magnetic field of flux density 1tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be

a. 10 V

b. 15 V

c. 25V

d. 50V

Q. Lenz's law is a consequence of the law of conservation of

a. induced current

b. charge

c. energy

d. induced e.m.f.

Top 50+ Solved Electromagnetic Induction MCQ Questions Answer

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