# Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 147

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## Question number: 1

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

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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 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.

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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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 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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### 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.

0.1 V

b.

1 V

c.

2 V

d.

0.01 V

## Question number: 4

» Electromagnetic Induction & Alternating Currents » Lenz's Law

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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 increases

b.

Current in each loop remains the same

c.

Current in each loop decreases

d.

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

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