EASY
CUET (UG)
IMPORTANT
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Assertion: If a varying current is flowing through a machine of iron, then eddy currents are produced.

Reason: Change in the magnetic flux through an area causes eddy currents.

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Important Questions on Electromagnetic Induction

EASY
CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 82

Assertion: A bar magnet is dropped into a long vertical copper tube. Even after taking air resistance as negligible, the magnet attains a constant terminal velocity. If the tube is heated, then the terminal velocity gets increased.

Reason: The terminal velocity depends on eddy current produced in a bar magnet.

EASY
CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 83
A house wife uses a 100 W bulb 8 hr a day , and an electric heater of 300 W for 4 hr a day. The total cost in ₹ for the month of June at the rate of ₹ 0.5 per unit will be:
 
EASY
CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 84
Assertion: eddy currents is used in making induction brakes.

Reason: As eddy currents always oppose the relative motion.
EASY
CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 85
Assertion: A thin aluminium disc, spinning freely about a central pivot, is quickly brought to rest when placed between the poles of a strong U-shaped magnet.

Reason: A current induced in a disc rotating in a magnetic field produces a force which tends to oppose the motion of the disc.
EASY
CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 86
Assertion: If a varying current is flowing through a machine of iron, eddy currents are produced

Reason: Change in the magnetic flux through an area causes eddy currents.
EASY
CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 87
Assertion: A bar magnet is dropped into a long vertical copper tube. Even taking air resistance as negligible, the magnet attains a constant terminal velocity. If the tube is heated, then the terminal velocity gets increased.

Reason: The terminal velocity depends on eddy current produced in bar magnet.
EASY
CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 88
The working of magnetic braking of trains is based on
EASY
CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 89
If in a galvanometer the coil is wound on a bad conductor, the eddy current will be