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1. When current in a coil change from 5 A to 2 A in 0.1 s, average voltage of 50V is produced. The
self-inductance of the coil is
(a)1.67H
(b)6H
(c)3H
(d) 0.67 H
Q1 A
2 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
(a)0.1V
(b)0.5V
(c)1V
(d) 5 V
Q2 D
3 Lenz’s law of electromagnetic induction is as per law of conservation of
(a)energy.
(b)Angular momentum
(c)charge.
(d) Mass
Q3 A
4 The current flows from A to B is as shown in the figure. The direction of the induced current in the loop is
(a) clockwise.
(b)anticlockwise.
(c)straight line.
(d) no induced e.m.f. produce
Q4 A
5 In a coil of self-induction 5 H, the rate of change of current is 2 A/s. Then emf induced in the coil is
(a) 10 V
(b) -10 V
(c) 5 V
(d) -5 V
Q5 A
6 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
(a) increase
(b) decrease
(c) remain same
(d) first increase then decrease
Q6 B
7 Which of the following statements is not correct?
(a) Whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in circuit.
(b) The induced emf lasts so long as the change in magnetic flux continues.
(c) The direction of induced emf is given by Lenz’s law.
(d) Lenz’s law is a consequence of the law of conservation of Charge.
Q7 D
8 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
(a) current is induced in the loop in the anti-clockwise direction.
(b) current is induced in the loop in the clockwise direction.
(c) ac is induced in the loop.
(d) no current is induced in the loop.
Q8 A
9 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?
(a) No induced emf is developed.
(b) The end A of the solenoid behaves like a south pole.
(c) The end A of the solenoid behaves like north pole.
(d) The end A of the solenoid acquires positive potential.
Q9 C
10 Identify the wrong statement.
(a) Eddy currents are produced in a steady magnetic field.
(b) Eddy currents can be minimized by using laminated core.
(c) Induction furnace uses eddy current to produce heat.
(d) Eddy current can be used to produce braking force in moving trains.
Q10 A
11 If number of turns in primary and secondary coils is increased to two times each, the mutual inductance
(a) becomes 4 times
(b) becomes 2 times
(c) becomes A times
(d) remains unchanged 4
Q11 A
13 Direction of current induced in a wire moving in a magnetic field is found using
(a) Fleming’s left hand rule
(b) Fleming’s right hand rule
(c) Ampere’s rule
(d) Right hand thumb rule
Q13 B
14 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
(a) increase
(b) decrease
(c) remain same
(d) first increase then decrease
Q14 B
15 Which of the following does not use the application of eddy current?
(a) Electric power meters
(b) Induction furnace
(c) LED lights
(d) Magnetic brakes in trains
Q15 C
ASSERTION (A) & REASONING (R) QUESTIONS
Of the following statements, mark the correct Answers as
A - if both Assertion and Reason -- are true and Reason -- is correct explanation of the Assertion.
B - if both Assertion and Reason -- are true but Reason -- is not correct explanation of Assertion.
C - if Assertion is true but Reason -- is false.
D - if both Assertion and Reason -- are false.
1. Assertion- Eddy current is produced in any metallic conductor when magnetic flux is changed around it .
Reason -- Electric potential determine the flow of charge.
Q1 B
2. Assertion -- The quantity L/R possesses dimensions of time.
Reason -- to reduce the rate of increase of current through a solenoid should increase the time constant L/R
Q2 B
3. Assertion- Faraday laws are consequence of conservation of energy.
Reason -- In a purely resistive AC circuit, the current lags behind the emf in phase.
Q3 C
4. Assertion- Only a change in magnetic flux through a coil maintain a current in the coil if the current is continues .
Reason -- The presence of large magnetic flux through a coil maintain a current in the coil if the
current is continues.
Q4 C
5. Assertion- Inductance coil are made of copper.
Reason -- Induced current is more in wire having less resistance
Q5 A
CASE STUDY BASED QUESTION
Electromagnetic induction is defined as the production of an electromotive force across an electric
conductor in the changing magnetic field. The discovery of induction was done by Michael Faraday
in the year 1831. Electromagnetic induction finds many applications such as in electrical components
which includes transformers, inductors, and other devices such as electric motors and generators.
Alternating current is defined as an electric current which reverse in direction periodically. In most
of the electric power circuits, the waveform of alternating current is the sine wave.
1. How to increase the energy stored in an inductor by four times?
(a) By doubling the current
(b) This is not possible
(c) By doubling the inductance
(d) By making current 2 times
1. (a)
2. Consider an inductor whose linear dimensions are tripled and the total number of turns per unit length is kept constant, what happens to the self-inductance?
(a) 9 times
(b) 3 times
(c) 27 times
(d) 13 times
2. (b)
3. Lenz law is based on which of the following conservation
(a) Charge
(b) Mass
(c) Momentum
(d) Energy
3. (d)
4. 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
4. (c)
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