# Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 9 - 11 of 124

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## Question number: 9

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

### Question

A thin semicircular conducting ring of radius R is falling with its plane vertical in a horizontal magnetic induction B. At the position MNQ shown in the fig, the speed of the ring is V. The potential difference developed across the semicircular ring is,

### Choices

Choice (4) Response

a.

and M is at higher potential

b.

π RBV and Q is at higher potential

c.

Zero

d.

2RBV and Q is at higher potential

## Question number: 10

» Electromagnetic Induction & Alternating Currents » Lenz's Law

MCQ▾

### Question

Consider the arrangement shown in figure in which the north pole of a magnet is moved away from a thick conducting loop containing capacitor. Then excess positive charge will arrive on

### Choices

Choice (4) Response

a.

Neither a nor b plates

b.

Plate b

c.

plates a and b

d.

Plate a

## Question number: 11

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

### Question

At certain location in the northern hemisphere, the earth’s magnetic field has a magnitude of 42 μT and points down ward at 57° to vertical. The flux through a horizontal surface of area 2.5 m 2 will be- (Given cos 33° = 0.839, cos 57° = 0.545)

### Choices

Choice (4) Response

a.

57 x 10 -6 Wb/m 2

b.

42 x 10 -6 Wb/m 2

c.

41 x 10 -6 Wb/m 2

d.

56 x 10 -6 Wb/m 2

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