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.
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Electromagnetic Induction question types
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100
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2 Marks Questions
11 Q→023 Marks Question
4 Q→031 Marks Question
34 Q→044 Marks Questions
1 Q→05M.C.Q (1 Marks)
36 Q→065 Marks Questions
14 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.
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?
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?
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 →What is the effect of core on self-induction?
Volt-second is unit of which physical quantity?
Write Faraday's laws of electromagnetic induction.
Write the expression for self-inductance of any coil.
Is it possible for a man sitting in the train to measure induced emf generated in axis of train?
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 →The device is based on the principle of mutual induction is:
- Aac generator
- Bgalvanometer
- Cvoltmeter
- ✓transformer
Answer: D.
View full solution →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 →Explain AC generator by drawing a labelled diagram. Obtain an expression for instantaneous magnitude of induced electromotive force.
Explain the experiments of Faraday and Henry for explaining and describing the phenomenon of electromagnetic induction.
Write Faraday's laws of electromagnetic induction and derive them.
What is magnetic flux. Explain factors on which it depends.
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?
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