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.

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CUET (UG)

IMPORTANT

Earn 100

A conducting rod $A B$ of length $l = 1 m$ , is moving at a velocity $v = 4 m s^{- 1}$ , making an angle $30^{\circ}$ with its length. A uniform magnetic field $B = 2 T$ exists in a direction perpendicular to the plane of motion. Then,

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Important Questions on Electromagnetic Induction

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CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 64

The wing span of an aeroplane is

36 m

. If the plane is flaying at

400 km h^{- 1}

, the emf induced between the wings tips is (assume

B = 4 \times 10^{- 5} T)

EASY

CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 65

A conducting square loop of side

L

and resistance

R

moves in its plane with a uniform velocity

v

perpendicular to one of its sides. A magnetic induction

B

constant in time and space, pointing perpendicular and into the plane of the loop exists everywhere with part of the loop outside the field, as shown in figure. The induced emf is

Question Image

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CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 66

The current from

A

B

is increasing in magnitude. What is the direction of induced current, if any, in the loop shown in figure.

Question Image

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 67

A loop of area

0.1 m^{2}

rotates with a speed of

60

rps perpendicular to a magnetic field of

0.4 T

. If there are

100

turns in the loop, maximum voltage induced in the loop is

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 68

The two rails of a railway track insulated from each other and the ground are connected to a milli-voltmeter. What is the reading of the

mV

, when a train travels at a speed of

180 k m h^{- 1}

along the track, given that the horizontal components of earth's magnetic field is

0.2 \times 10^{- 4} W b m^{- 2}

and the rails are separated by

1 m

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 69

A metallic circular loop of radius

r

is placed in a uniform magnetic field

B

, acting perpendicular to the plane of the loop. A naughty boy pulls the diametrically opposite corner so that, after sometime, the loop changes into an ellipse of major and minor radius

a

and

b

. If total resistance of loop is

R

and it remains constant during the pulling, find the average charge flowing through loop during the pulling.

EASY

CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 70

A metallic rod of length $l$ is rotated at a constant angular speed $ω$ , normal to a uniform magnetic field $B$ . Derive an expression for the current induced in the rod, if the resistance of the rod is $R$ (both the ends of the rod are connected and the circuit is close).

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 71

If a

10 m

long metallic bar moves in a direction at right angles to the magnetic field, with a speed of

5 m s^{- 1}

25 V

emf is induced in it. Find the value of magnetic field intensity.

A conducting rod AB of length l=1 m, is moving at a velocity v=4 m s-1, making an angle 30∘ with its length. A uniform magnetic field B = 2T exists in a direction perpendicular to the plane of motion. Then,

Important Questions on Electromagnetic Induction

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A conducting rod $A B$ of length $l = 1 m$ , is moving at a velocity $v = 4 m s^{- 1}$ , making an angle $30^{\circ}$ with its length. A uniform magnetic field $B = 2 T$ exists in a direction perpendicular to the plane of motion. Then,