Electromagnetic Induction & Alternating Currents-Electromagnetic Induction [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 4 of 18

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Question number: 1

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

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Question

A square loop of side a is rotating about its diagonal with angular velocity ω in a perpendicular magnetic field as shown in the figure. If the number of turns in it is 10 then the magnetic flux linked with the loop at any instant will be-

Choices

Choice (4)Response

a.

20Ba 2

b.

10Ba 2 cos (ωt)

c.

10Ba

d.

10Ba 2

Question number: 2

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

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A loop of wire is placed in a magnetic field B = 0.02i T. Then the flux through the loop if its area vector is

Choices

Choice (4)Response

a.

32 μ Wb

b.

138 μ Wb

c.

46 μ Wb

d.

60 μ Wb

Question number: 3

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

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The distance between the ends of wings of an airplane is 3m. This airplane is descending down with a speed of 300 km/hour. If the horizontal component of earth’s magnetic field is 0.4 gauss then the value of e. m. f. induced in the wings of the plane will be –

Choices

Choice (4)Response

a.

0.1 V

b.

1 V

c.

2 V

d.

0.01 V

Question number: 4

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

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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.

42 x 10 -6 Wb/m 2

b.

57 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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