The device is based on the principle of mutual induction is:
- Aac generator
- Bgalvanometer
- Cvoltmeter
- ✓transformer
Answer: D.
View full solution →Question types
Electromagnetic Induction question types
118 questions across 7 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
118
Questions
7
Question groups
5
Question types
01
M.C.Q [1M]
36 Q→021 Marks Question
35 Q→03Short Answer Type Questions [2M]
14 Q→043 Marks Question
5 Q→054 Marks Questions
2 Q→06Long Answer Type Questions [5M]
16 Q→07Fill in the blanks.[1M]
10 Q→Sample Questions
Electromagnetic Induction questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
In the given figure, an electron is moving from A to B. The direction of A induced current in the loop is:
- ✓First anticlockwise and then clockwise after crossing C
- BFirst clockwise and then anticlockwise after crossing C
- CAnticlockwise
- DClockwise
Answer: A.
View full solution →A rectangular coil is rotating with a uniform angular velocity between magnetic poles. The correct graph of change of magnetic flux $\phi$ passing through the coil and induced emf (c) with time is :
- A
- B
- ✓
- D
Answer: C.
View full solution →A coil of copper and a wire AB are located in the plane of the paper as shown in the figure. If current I flowing through the wire is increasing, then the direction of induced current in the coil is:
- AAnticlockwise
- ✓Clockwise
- CNo induced current will be generated
- DNone of the above
Answer: B.
View full solution →Lenz's law gives:
- AMagnitude of induced emf
- ✓Direction of induced current
- CBoth direction and magnitude of induced current
- DMagnitude of induced current
Answer: B.
View full solution →What is the effect of core on self-induction?
Volt-second is unit of which physical quantity?
Use Lenz's law to determine the direction of induced current in the situations described in the given figure:
(a) A wire of irregular shape turning into a circular shape.
(b) A circular loop being deformed into a narrow straight wire.
(a) A wire of irregular shape turning into a circular shape.
(b) A circular loop being deformed into a narrow straight wire.
Graph between magnetic flux $\phi$ and electric current $I$ for two inductors $A$ and $B$ is given in the figure. The magnitude of self-inductance will be more for whom?
View full solution →In the given figure, magnitude of current is increasing in the wire xy from x to y . Is there any induced current in a loop placed near the wire?
A 5 m long straight horizontal conducting wire situated in the east to west direction is falling with a speed of $2 m / s$ perpendicular to the horizontal component of the earth magnetic field of $0.3 \times 10^{-4} T$. Find the instantaneous value of the emf induced between the ends of the wire.
View full solution →A pair of adjacent coils have a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5 s, what is the change of the flux linkage with the other coil?
Current in a circuit falls from 5.0 A to 0.0 A in 0.1 s. If an average emf of 200 V induced, give an estimate of the self-inductance of the coil.
A 1.0 m long metallic rod is rotated with an angular frequency of 400 rad$s ^{-1}$ about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant and uniform magnetic field of 0.5 T parallel to the axis exists everywhere. Calculate the emf developed between the centre and the ring.
View full solution →State factors on which coefficient of mutualinductance between two coils depend.
Draw a clear and labelled diagram of an alternating current generator.
A horizontal straight wire 10 m long extending from east to west is falling with a speed of $5.0 ms^{-1}$, at right angles to component of the earth's magnetic field $0.30 \times 10^{-4} Wbm ^{-2}$.
(a) What is the instantaneous value of the emf induced in the wire?
(b) What is the direction of the emf?
(c) Which end of the wire is at the higher electrical potential?
View full solution →(a) What is the instantaneous value of the emf induced in the wire?
(b) What is the direction of the emf?
(c) Which end of the wire is at the higher electrical potential?
Write statement of Lenz's law of electromagnetism. A 2 m long straight vertical wire is falling perpendicularly to horizontal component at speed of 5 $m / s$ in the magnetic field of earth of $0.3 \times 10^{-4} T$. Calculate the magnitude of instantaneous value of induced emf across the ends of the wire.
View full solution →What will be maximum mutual inductance between coils of self-inductance $L_1$ and $L_2$ ?
View full solution →Radius of a disc of copper is 10 cm . It is rotating about an axis which is perpendicular to its plane and passing through its centre at the rate of $20 \pi rad /$ second. Uniform magnetic field of 0.2 T is working perpendicular to the disc. (i) Calculate potential difference between axis and circumference of the disc. (ii) If resistance of disc is 2 , then what is the magnitude of induced current?
View full solution →Predict the direction of induced current in the situations described by the following figures (a) to (f).
A square loop of a metallic wire of side 10 cm whose resistance is 1 ohm is moving with a constant velocity of as shown in the figure in a uniform magnetic field of $200 Wb / m ^2$. The magnetic field is normal to the plane of paper inwards. This loop is connected to a network of resistors of magnitude 3 ohms. Resistance of wire OS and PQ are negligible. What will be the magnitude of velocity, $v_0$ to flow one ampere of direct current in the loop? Also, what will be the direction of current?
View full solution →Explain AC generator by drawing a labelled diagram. Obtain an expression for instantaneous magnitude of induced electromotive force.
A rectangular wire loop of sides 8 cm and 2 cm having a small cut is moving out of a region of uniform magnetic field of magnitude 0.3 T directed normal to the loop. What is the emf developed across the cut if the velocity of the loop is $1 cm s ^{-1}$ in a direction normal to the (a) longer side (b) shorter side of the loop? For how long does the induced voltage last in each case?
View full solution →A long solenoid with 15 turns per cm has a small loop of area 2.0 cm² placed inside the solenoid normal to its axis. If the current carried by the solenoid changes steadily from 2.0 A to 4.0 A in 0.1 s. What is the induced emf in the loop while the current is changing?
With the help of a labelled diagram, explain how does an AC works. There are $N$ turns in coil of AC generator. Area of each turn is A and the coil is rotating with a uniform angular velocity. Establish an expression for generated induced electromotive force. What is the source of energy production by this method?
View full solution →What is magnetic flux. Explain factors on which it depends.
According to Lenz's law, induced current always opposes the change in ___________.
Fleming's right hand rule is used to find out the direction of __________.
Lenz's law follow law of conservation of ___________.
Magnetic flux for magnetic field lines coming out from any surface is ___________.
Unit of magnetic flux in C.G.S. system is ___________.
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