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
110 questions across 7 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
110
Questions
7
Question groups
5
Question types
01
M.C.Q (1 Marks)
36 Q→021 Marks Question
34 Q→032 Marks Questions
11 Q→043 Marks Question
4 Q→055 Marks Questions
14 Q→06Case study (4 Marks)
1 Q→07Fill in the blanks.
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.
A square loop of side 22 cm is converted into circular loop of 0.45. If uniform magnetic field of 0.2 T is perpendicular to the loop, then induced electromotive force in the loop is:
- ✓$6.6 \times 10^{-3} V$
- B$6.6 \times 10^{-5} V$
- C$4.6 \times 10^{-4} V$
- D$4.60 \times 10^{-8} V$
Answer: A.
View full solution →A square coil of area $10^{-2} m^2$ is kept perpendicular in a magnetic field of intensity $10^3 Wb / m ^2$. The magnitude of magnetic flux passing through the square is :
- ✓10 Wb
- B$10^{-5} Wb$
- C$10^{5} Wb$
- D100 Wb
Answer: A.
View full solution →A coil of 40 turns and area $4 cm^2$ is suddenly removed from a magnetic field. Charge of $2 \times 10^{-4} C$ flows through it. If its resistance is 80 ohms, then magnetic flux density is:
- A0.5
- ✓1
- C1.5
- D2
Answer: B.
View full solution →In a circuit of resistance $R$, magnetic flux $\Delta \phi$ changes in time $\Delta t$. Total charge $Q$ flowing through the circuit in time $\Delta r$ is :
- A$Q=\frac{\Delta \phi}{\Delta t}$
- B$Q =\frac{\Delta \phi}{\Delta t} \times R$
- C$Q=\frac{-\Delta \phi}{\Delta t} \times R$
- ✓$Q =\frac{\Delta \phi}{ R }$
Answer: D.
View full solution →What is the effect of core on self-induction?
Volt$-$second is unit of which physical quantity?
View full solution →Current in any circuit decreases from 5.0 A to 1.0 A in 0.1 s. If average induced emf is 200 V, then analyze self-induction in the coil.
In the figure given below, on moving a magnet NS kept between two coils AB and CD in the direction of arrow, in which coil the direction of induced current will be anticlockwise when seen from left?
Write Faraday's laws of electromagnetic induction.
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 →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 →State factors on which coefficient of mutualinductance between two coils depend.
A lamp attached to a cycle glows by a dynamo. When cycle is moved at greater speed, the lamp glows brightly and when cycle moves with a lesser speed, it glows dimly. Why?
Two bar magnets are moving rapidly towards a metallic loop joined across a capacitor C as shown in the figure. What is the polarity of the capacitor?
Draw a clear and labelled diagram of an alternating current generator.
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 →Explain AC generator by drawing a labelled diagram. Obtain an expression for instantaneous magnitude of induced electromotive force.
(i) How will you show that Lenz's law is a conclusion of energy conservation law? Explain with suitable examples.
(ii) Using the expression for Lorentz force applied on charge carriers of any conductor, obtain an expression for that induced emf which is induced in a conductor of length $l$ moving with a velocity $v$, perpendicular to any magnetic field $B$.
View full solution →(ii) Using the expression for Lorentz force applied on charge carriers of any conductor, obtain an expression for that induced emf which is induced in a conductor of length $l$ moving with a velocity $v$, perpendicular to any magnetic field $B$.
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 do you understand by self-induction?Obtain an expression for self-induction of a solenoid.###Define self-induction. Obtain an expression for self-induction of a solenoid of N turns, length $l$ and area of cross-section A.
View full solution →Define induction coefficient. Explain the phenomenon of mutual inductance with the help of an experiment. Obtain an expression for mutual inductance coefficient of two solenoids and prove that $M=\sqrt{L_1 L_2}$.
View full solution →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 →Direction of induced current is obtained by $...............$ Law.
View full solution →Transformer and induction coil are examples of $...............$
View full solution →Coefficient of self$-$induction of a long solenoid is $L =...............$
View full solution →Unit of coefficient of self-induction is $...............$
View full solution →Dimensions of coefficient of self-inductance are $...............$
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