Electromagnetic Induction and Alternating Current MCQ. We covered all the Electromagnetic Induction and Alternating Current MCQ in this post for free so that you can practice well for the exam.
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MCQ on Electromagnetic Induction and Alternating Current for NEET Students
A 240-volt a.c. the source is connected across a pure inductor of inductance 0.60 henry. If the frequency of the source is 60 Hz, the current passing through the inductor is
(A) 4.55 ampere
(B) 1.1 ampere
(C) 0.455 ampere
(D) 3.55 ampere
Option b – 1.1 ampere
Which of the following statement is true? In a purely inductive circuit containing inductor only ……..
(A) e.m.f leads current by an angle of 90°
(B) e.m.f lags current by an angle of 90°
(C) e.m.f and current are in phase
(D) e.m.f leads current by the angle of 180°
Option a – e.m.f leads current by an angle of 90°
Which of the following statement is false?
(A) Eddy current causes damping.
(B) Eddy current causes heating.
(C) Eddy current causes loss of energy.
(D) Eddy’s current causes sparking.
Option d – Eddy’s current causes sparking.
……… has no effect of pure inductive.
(B) direct current
(C) root mean square current
(D) none of the above.
Option b – direct current
The unit of magnetic flux in the C.G.S system is
(A) weber
(B) gauss
(C) maxwell
(D) tesla
Option c – maxwell
The value of self-inductance of a circular coil is directly proportional to
(A) the cube of its number of turns.
(B) square of its number of turns.
(C) the square root of its number of turns
(D) cube root of its number of turns.
Option b – square of its number of turns.
A 0.4-henry inductor is connected across 120 V 60 Hz a.c. source. The current in the inductor will be very nearly
(A) 4.55 ampere
(B) 0.355 ampere
(C) 0.796 ampere
(D) 3.55 ampere
Option c – 0.796 ampere
Which of the following statement is correct?
(A) Resistance is independent of the frequency of a.c.
(B) Resistance is dependent on the frequency of a.c.
(C) Capacitive reactance is independent of the frequency of a.c.
(D) Impedance is independent of the frequency of a.c.
Option a – Resistance is independent of the frequency of a.c.
The current in a coil decreases from 0.5 A to 0.2 A in 5 s. Calculate the coefficient of self-inductance if induced e.m.f is 0.5 volt.
(A) 1.333 H
(B) 2.66 H
(C) 8.33 H
(D) 4.33 H
Option c – 8.33 H
In general, in an alternating current circuit
(A) the average value of the current is zero.
(B) the average value of the square of the current is zero.
(C) average power dissipation is zero.
(D) the phase difference between voltage and current is zero.
Option a – the average value of the current is zero.
The magnetic flux across a certain area is equal to the
(A) vector product of the vector field and the vector area.
(B) product of the vector field and the scalar area.
(C) product of the scalar field and the scalar area.
(D) scalar product of the vector field and the vector area.
If the current of 50 A flowing the primary coil is made zero in 0.2 s, then the e.m.f induced in the secondary coil is 2 volts. The mutual inductance between the coils is
(A) 8 mH
(B) 1.8 H
(C) 0.8 H
(D) 0.8 mH
Option a – 8 mH
Which one of the following is a wrong statement?
(A) An e.m.f can be induced between the ends of a straight conductor by moving it through a uniform magnetic field.
(B) The self-induced e.m.f produced by changing the current in a coil always tends to decrease the current.
(C) Inserting an iron core in a coil increases its coefficient of self-induction.
(D) According to Lenz’s law, the direction of the induced e.m.f. is such that it opposes the change in flux that causes it.
Option b – The self-induced e.m.f produced by changing the current in a coil always tends to decrease the current.
Calculate the self-inductance of the coil if an e.m.f of 12 V is induced in it when the current in it changes at the rate of 50 amperes per minute.
(A) 8.96 H
(B) 14.4 H
(C) 12.4 H
(D) 16.8 H
Option b – 14.4 H
How does the current in an RC circuit vary when the charge on the capacitor builds up?
(A) It increases linearly.
(B) It increases exponentially.
(C) It decreases linearly.
(D) It decreases exponentially.
Option d – It decreases exponentially.
Two identical circular metal coils A and B are kept on a table in such a way that they are very close, but they do not touch each other. Coil A carries a current and it is slowly increased. What is the response of coil B?
(A) B is attracted by A.
(B) B is repelled by A.
(C) B is not affected.
(D) B is first attracted by A and then repelled.
Option b – B is repelled by A.
Lenz’s law is applicable
(A) only in open circuits.
(B) only in closed circuits.
(C) in both opened and closed circuits.
(D) only in a uniform magnetic field.
Option b – only in closed circuits.
A circular coil of radius 10 cm has 600 turns of wire on it. The approximate value of the coefficient of self-induction of the coil will be
(A) 0.05 H
(B) 0.02 H
(C) 0.07 H
(D) 0.09 H
Option c – 0.07 H
When flux decreases, e.m.f induced is
(A) positive.
(B) negative.
(C) zero.
(D) infinite.
Option a – positive.
In mutual induction, the main current remains the same because
(A) the induced current is produced in the secondary coil.
(B) the induced current is produced in the primary coil.
(C) the induced current is not produced.
(D) the induced current is produced in both primary and secondary coils.
Option a – the induced current is produced in the secondary coil.
When the north pole of the magnet is brought towards the coil, the current generated in the coil flows in ………..
(A) clockwise direction
(B) anticlockwise direction
(C) periodically
(D) sinusoidal manner
Option b – anticlockwise direction
A coil of area 80 square cm and 100 turns is rotating with 2000 revolutions per minute about an axis perpendicular to a magnetic field of 0.05 tesla. The maximum value of the e.m.f developed in it is
(A) 0.084 π volt
(B) 0.84 volt
(C) 8.4 volt
(D) 84 volt
Option c – 8.4 volt
Ohm-second is also termed as ………
(A) farad
(B) volt
(C) henry
(D) siemens
Option c – henry
Calculate the magnetic flux linked with the coil of 200 turns and area 10 cm² when placed in a magnetic field of 0.4 T where normal to the plane of the coil makes an angle of 60° with the direction of the magnetic field.
(A) 20 Wb
(B) 20 mWb
(C) 40 Wb
(D) 40 mWb
Option d – 40 mWb
If a magnet is moved towards a coil, the magnitude of induced e.m.f in the coil is independent of i. velocity of the magnet. ii. length of the magnet. iii. the breadth of the magnet. iv. the density of the magnet.
(A) i, ii, iii
(B) ii, iii, iv
(C) i, iii, iv
(D) i, ii, iv
Option b – ii, iii, iv
Two coils are placed close to each other. The mutual inductance of the pair of coils does not depend upon i. the currents in the two coils. ii. the rates at which currents are changing in the two coils. iii. the relative position and orientation of the two coils. iv. the materials of the wires of the coils.
(A) i, iii and iv
(B) i, ii, and iv
(C) ii, iii and iv
(D) i, ii and iii
Option b – i, ii, and iv
Capacitive reactance in an A.C. circuit is
(A) the effective voltage across the capacitor connected to the circuit.
(B) effective wattage of the capacitor connected to the circuit.
(C) effective capacity of the capacitor connected to the circuit.
(D) effective resistance offered by the capacitor to the flow of A.C.
Option d – effective resistance offered by the capacitor to the flow of A.C
A coil having 600 square loops on each side 30 cm is placed normally to a magnetic flux which increases at the rate of 2 tesla/ second. The induced e.m.f in volts is
(A) 108 V
(B) 120 V
(C) 102 V
(D) 125 V
Option a – 108 V
The frequency of an alternating voltage is 60 cycles/s and its peak emf is 100 V. Then the r.m.s value of voltage is
(A) 101.3 V
(B) 84.8 V
(C) 70.7 V
(D) 56.5 V
Option c – 70.7 V
Which of the following instruments does not make use of eddy currents? ( Electromagnetic Induction and Alternating Current MCQ )
(A) Electrical brakes.
(B) Induction motor.
(C) Transformer.
(D) Deadbeat galvanometer.
Option c – Transformer.
What will be the e.m.f induced in the coil having an area of 0.2 m² and having 400 turns on it, when the magnetic field of 0.5 T gets linked perpendicular to its area, the magnetic field changes to 1 T in 0.5 s.
(A) 20 V
(B) 80 V
(C) 100 V
(D) 40 V
Option b – 80 V
Calculate the value of self-inductance of a coil when an e.m.f of 6 V is produced by a self-inductance when the current in it changes at a steady rate from 3 A to 1 A in 1 ms.
(A) 1 mH
(B) 3 mH
(C) 9 mH
(D) 6 mH
Option b – 3 mH
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