# Electromagnetic Waves-Electromagnetic Waves & Characteristics [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 4 of 27

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## Question number: 1

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

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MCQ▾

### Question

A point source of 2 watt is radiating uniformly in all direction in vacuum. Find the amplitude of electric field at a distance 2m from it-

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 2

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

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MCQ▾

### Question

Light wave is travelling along + y-direction. If the corresponding E vector at that time is along + x-direction, B vector must be directed along.

### Choices

Choice (4)Response

a.

+ Z axis

b.

- Z axis

c.

X-axis

d.

Y-axis

## Question number: 3

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

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MCQ▾

### Question

An electromagnetic wave of frequency ν = 3.0 MHz passes from vacuum into a dielectric medium with permittivity ϵ r = 4.0. Then the wrong statements are

(1) Wavelength is doubled and the frequency remains unchanged

(2) Wavelength is doubled and frequency becomes half

(3) Wavelength and frequency both remain unchanged

(4) Wavelength is halved and frequency remains unchanged

Select the correct answers and mark it according to the following codes:

Codes:

### Choices

Choice (4)Response

a.

2 and 4 are correct

b.

1 and 3 are correct

c.

1,2 and 3 are correct

d.

1 and 2 are correct

## Question number: 4

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

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MCQ▾

### Question

Electromagnetic waves travel in a medium which has relative permeability 1.3 and relative permittivity 2.14. Then the speed of the electromagnetic wave in the medium will be

### Choices

Choice (4)Response

a.

1.8 x 10 8 m/s

b.

13.6 x 10 6 m/s

c.

1.8 x 10 2 m/s

d.

3.6 x 10 8 m/s

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