Lenz's law provides a relation between

induced emf and rate of change of flux

force on a current carrying conductor and magnetic field

magnetic force and electrostatic force

A metal ring is held horizontally and bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet

depends on the diameter of ring and length of magnet.

E M B I B E

Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 84

EASY

CUET (UG)

IMPORTANT

Earn 100

Assertion: eddy currents is used in making induction brakes.

Reason: As eddy currents always oppose the relative motion.

69.57% studentsanswered this correctly

Important Questions on Electromagnetic Induction

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

EASY

CUET (UG)