MEDIUM
12th Karnataka Board
IMPORTANT
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Use Lenz’s law to determine the direction of induced current in the situation described by figure:

A wire of irregular shape turning into a circular shape.

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Important Questions on Electromagnetic Induction

MEDIUM
12th Karnataka Board
IMPORTANT
PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 6 - Electromagnetic Induction>EXERCISES>Q 6.2

Use Lenz’s law to determine the direction of induced current in the situations described by the following figure:

A circular loop being deformed into a narrow straight wire.

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MEDIUM
12th Karnataka Board
IMPORTANT
PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 6 - Electromagnetic Induction>EXERCISES>Q 6.3
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?
HARD
12th Karnataka Board
IMPORTANT
PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 6 - Electromagnetic Induction>EXERCISES>Q 6.4
A rectangular wire loop of sides 8 cm and 2 cm with 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 cms–1 in a direction normal to the longer side of the loop? For how long does the induced voltage last in this case?
HARD
12th Karnataka Board
IMPORTANT
PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 6 - Electromagnetic Induction>EXERCISES>Q 6.4
A rectangular wire loop of sides 8 cm and 2 cm with 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 cms–1 in a direction normal to the shorter side of the loop? For how long does the induced voltage last in this case?
MEDIUM
12th Karnataka Board
IMPORTANT
PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 6 - Electromagnetic Induction>EXERCISES>Q 6.5
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
HARD
12th Karnataka Board
IMPORTANT
PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 6 - Electromagnetic Induction>EXERCISES>Q 6.6
A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with an angular speed of 50 rad s–1 in a uniform horizontal magnetic field of magnitude 3.0×10–2 T. Obtain the maximum and average emf induced in the coil. If the coil forms a closed loop of resistance 10 Ω, calculate the maximum value of current in the coil. Calculate the average power loss due to Joule heating. Where does this power come from?
MEDIUM
12th Karnataka Board
IMPORTANT
PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 6 - Electromagnetic Induction>EXERCISES>Q 6.7

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 the horizontal component of the earth’s magnetic field. a) What is the instantaneous value of the emf induced in the wire? (b) What is the direction of emf? c) Which end of the wire is at the higher electrical potential?

MEDIUM
12th Karnataka Board
IMPORTANT
PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 6 - Electromagnetic Induction>EXERCISES>Q 6.8
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 circuit.