# Electromagnetic Induction & Alternating Currents-Electromagnetic Induction (NEET (National Eligibility cum Medical Entrance Test) 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 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-

### 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-

### Choices

Choice (4) Response

a.

b.

c.

Zero

d.

f Page