Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 5 - 8 of 121

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Question number: 5

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

Question

A bicycle wheel of radius 0.5 m has 32 spokes. It is rotating at the rate of 120 revolutions per minute, perpendicular to the horizontal component of earth’s magnetic field B H = 4 x 10 -5 tesla. The emf induced between the rim and the center of the wheel will be,

Choices

Choice (4) Response

a.

6.0 x 10 -5 V

b.

4.8 x 10 -5 V

c.

6.28 x 10 -5 V

d.

1.6 x 10 -5 V

Question number: 6

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

Question

When a small piece of wire passes between the magnetic poles of a horse-shoe magnet in 0.1 sec, emf of 4 x 10 -3 volt is induced in it. The magnetic flux between the poles is,

Choices

Choice (4) Response

a.

4 x 10 -3 weber

b.

4 x l0 -4 weber

c.

4 x 10 -6 weber

d.

4 x l0 -2 weber

Question number: 7

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

A closed coil consists of 500 turns on a rectangular frame of area 4.0 cm 2 and has a resistance of 50 ohm. The coil is kept with its plane perpendicular to a uniform magnetic field of 0.2 weber/meter 2. The amount of charge flowing through the coil if it is turned over (rotated through 180°) will be -

Choices

Choice (4) Response

a.

1.6 x 10 -19 C

b.

1.6 x 10 -9 C

c.

1.6 x 10 -2 C

d.

1.6 x 10 -3 C

Question number: 8

» Electromagnetic Induction & Alternating Currents » Lenz's Law

MCQ▾

Question

A current carrying solenoid is approaching a conducting loop as shown in the figure. The direction of induced current as observed by an observer on the other side of the loop will be –

Current carrying solenoid

Current Carrying Solenoid

A current carrying solenoid is approaching a conducting loop as shown in the figure.

Choices

Choice (4) Response

a.

Clockwise

b.

West

c.

East

d.

Anti-clockwise

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