Electromagnetic Induction & Alternating Currents-Electromagnetic Induction (NEET Physics): Questions 5 - 8 of 8

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Question number: 5

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

Two rail tracks, insulated from each other and the ground, are connected to milli voltmeter. What is the reading of the milli voltmeter when a train passes at a speed of 180 km/hr along the track? Given that - the horizontal component of earth’s magnetic field B H is 0.2 x 10 -4 Wb/m 2 and rails are separated by 1 meter.

Choices

Choice (4) Response

a.

1 V

b.

10 mV

c.

l mV

d.

100 mV

Question number: 6

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

Assertion-Reason▾

Assertion (Ꭺ)

An aircraft flies along the meridian, the potential at the ends of its wings will be the same.

Reason (Ꭱ)

Whenever there is change in the magnetic flux e. m. f. induces.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 7

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

A conducting wire in the shape of Y with each side of length l is moving in a uniform magnetic field B, with a uniform speed v as shown in fig. The induced emf at the two ends X and Y of the wire will be-

 A conducting wire shape of Y in uniform magnetic field

a Conducting Wire Shape of Y in Uniform Magnetic Field

A conducting wire in the shape of Y with each side of length l is placed in uniform magnetic field B.

Choices

Choice (4) Response

a.

Zero

b.

2 Blv sin (θ/2)

c.

2 Blv

d.

2 Blv cos (θ/2)

Question number: 8

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

The angular disc of copper, with inner radius a and outer radius b is rotating with a uniform angular speed ω, in a region where a uniform magnetic field B along the axis of rotation exists. Then, the emf induced between inner side and the outer rim of the disc is-

Angular disc of copper in magnetic field

Angular Disc of Copper in Magnetic Field

The angular disc of copper, with inner radius a and outer radius b is placed in a uniform magnetic field B.

Choices

Choice (4) Response

a.

12Bωa2

b.

12Bωb2

c.

Zero

d.

12Bω(b2a2)

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