MCQ’S ON ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS
Q- Lenz law is based on which of the following conservation>
(a) Charge
(b) Mass
(c) Momentum
(d) Energy
Answer: (d) Energy
Q- What will be the acceleration of the falling bar magnet which passes through the ring such that the ring is held horizontally and the bar magnet is dropped along the axis of the ring?
(a) It depends on the diameter of the ring and the length of the magnet
(b) It is equal due to gravity
(c) It is less than due to gravity
(d) It is more than due to gravity
Answer: (c) It is less than due to gravity
Q- An observer is seeing the setup of an aluminium ring B facing an electromagnet A. The current I through A can be altered if
(a) B is independent of an increase or decrease of I
(b) If I increases, A will attract B
(c) If I increase, A will repel B
(d) If I decrease, A will repel B
Answer: (c) If I increase, A will repel B
Q- What is the equivalent inductance of the following circuit if the pure inductance is 3.0H
(a) 9H
(b) 3H
(c) 1H
(d) 2H
Answer: (c) 1H
Q- What is the need for laminating the core of a transformer?
(a) To reduce the resistance in the winding
(b) To reduce the eddy currents
(c) To reduce the hysteresis
(d) None of the above
Answer: (b) To reduce the eddy currents
Q- Which of the following represent the variation of induced EMF with respect to time t if a short bar magnet is moved along its axis and has a constant velocity.
Answer: (b)
Q- A wire loop is rotated in a magnetic field such that the frequency of change of direction of the induced emf is
(a) Six times per revolution
(b) Four times per revolution
(c) Twice per revolution
(d) Once per revolution
Answer: (c) Twice per revolution
Q- Which of the following is the equivalent quantity of mass in electricity?
(a) Current
(b) Charge
(c) Potential
(d) Inductance
Answer: (d) Inductance
Q- What is the unit of inductance?
(a) Volt/ampere
(b) Joule/ampere
(c) Volt-ampere/sec
(d) Volt-sec/ampere
Answer: (d) Volt-sec/ampere
Q- What is the angle made by the plane of eddy currents with the plane of magnetic lines of force?
(a) 0°
(b) 40°
(c) 90°
(d) 180°
Answer: (c) 90°
