Q. Two coils are placed closed to each other. The mutual inductance of the pair of coils depends upon
✅ Correct Answer: (B)
relative position and orientation of two coils.
Electromagnetic Induction MCQs with answers
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Q. When current in a coil changes from 5 A to 2 A in 0.1 s, average voltage of 50 V is produced. The self-inductance of the coil is
✅ Correct Answer: (A)
1.67 H
Q. A coil having 500 sq. loops of side 10 cm is placed normal to magnetic flux which increases at a rate of 1 T/s. The induced emf is
✅ Correct Answer: (D)
5 V
Q. A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10-5 weber. The inductance is
✅ Correct Answer: (C)
0.02 mH
Q. Lenz’s law of electromagnetic induction is as per law of conservation of
✅ Correct Answer: (A)
energy
Q. The current flows from A to B is as shown in the figure. The direction of the induced current in the loop is
✅ Correct Answer: (A)
clockwise
Q. 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 The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly.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
✅ Correct Answer: (D)
moving out of the solenoid
Q. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in
✅ Correct Answer: (D)
both P and Q decreases
Q. Which of the following does not use the application of eddy current?
✅ Correct Answer: (C)
LED lights
Q. If number of turns in primary and secondary coils is increased to two times each, the mutual inductance
✅ Correct Answer: (A)
becomes 4 times
Q. When the rate of change oic current is unity, the induced emf is equal to
✅ Correct Answer: (C)
coefficient of self inductance
Q. Two inductors of inductance .L each are connected in series with opposite? magnetic fluxes. The resultant inductance is
(Ignore mutual inductance)
(Ignore mutual inductance)
✅ Correct Answer: (C)
2L
Q. 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
✅ Correct Answer: (A)
a direct current flows in the ammeter A
Q. 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
✅ Correct Answer: (D)
there is a constant current in the counterclockwise direction in A.
Q. Same as question 4 except the coil A is made to rotate about a vertical axis (Figure). No current flows in B if A is at rest. The current in coil A, when the current in B (at t = 0) is counterclockwise and the coil A is as shown at this instant, t = 0, is
✅ Correct Answer: (A)
constant current clockwise.
Q. An e.m.f is produced in a coil, which is not connected to an external voltage source. This is not due to
✅ Correct Answer: (D)
the coil is stationary in external spatially varying magnetic field, which does not change with time.
Q. Identify the wrong statement.
✅ Correct Answer: (A)
Eddy currents are produced in a steady magnetic field.
Q. 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?
✅ Correct Answer: (C)
The end A of the solenoid behaves like north pole.
Q. 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
✅ Correct Answer: (B)
anticlockwise
Q. 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
✅ Correct Answer: (A)
current is induced in the loop in the anti-clockwise direction.
Q. Which of the following statements is not correct?
✅ Correct Answer: (D)
Lenz’s law is a consequence of the law of conservation of momentum.
Q. 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
✅ Correct Answer: (B)
decrease
Q. Direction of current induced in a wire moving in a magnetic field is found using
✅ Correct Answer: (B)
Fleming’s right hand rule
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