Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 1 - 4 of 121

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Question number: 1

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

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-

A square loop of side a in magnetic field

A Square Loop of Side a in Magnetic Field

In figure, a square loop of side a is rotating about its diagonal with angular velocity ω in a perpendicular magnetic field.

Choices

Choice (4) Response
a.

10Ba 2

b.

10Ba

c.

10Ba 2 cos (ωt)

d.

20Ba 2

Question number: 2

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

A loop of wire is placed in a magnetic field B = 0.02i T. Then the flux through the loop if its area vector A=(30i^+16j^+23k^)cm2 is

Choices

Choice (4) Response
a.

60 μ Wb

b.

46 μ Wb

c.

32 μ Wb

d.

138 μ Wb

Question number: 3

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

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.

0.01 V

b.

2 V

c.

0.1 V

d.

1 V

Question number: 4

» Electromagnetic Induction & Alternating Currents » Lenz's Law

MCQ▾

Question

Two identical coaxial circular loops carry current i each circulating in the clockwise direction. If the loops are approaching each other, then

Choices

Choice (4) Response
a.

Current in each loop remains the same

b.

Current in each loop decreases

c.

Current in each loop increases

d.

Current in one-loop increases and in the other it decreases

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