If an electromagnetic wave going through a medium is given by; 
\(E=E_{0}sin\left ( kx-\omega t \right )\) and \(B=B_{0}sin\left ( kx-\omega t \right ),\) then:

1. E0k=B0ω
2. If the electric field is in the z-direction then the magnetic field should be in the -y direction
3. Both 1 and 2 are correct
4. Only 1 is correct

Subtopic:  Properties of EM Waves |
 68%
From NCERT
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A plane E M wave of frequency 25 MHz travels in free space in the x-direction. At a particular point in space and time E=6.3 j^ V/m then B at the point is 

(1) 2.1×10-8 -k^

(2) 2.1×10-8 k^

(3) 2.1 k^

(4) 2.1×10-8 i^

Subtopic:  Properties of EM Waves |
 81%
From NCERT
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In an electromagnetic wave, the amplitude of electric field is 1 V/m. The frequency of wave is 5×1014 Hz. The wave is propagating along Z-axis. The average energy density of electric field in joule/m3, will be

(1) 2.2×10-12

(2) 4.4×10-12

(3) 6.6×10-12

(4) 8.8×10-12

Subtopic:  Properties of EM Waves |
 58%
From NCERT
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The infra-red spectrum lies between :

(1) radio wave and microwave region

(2) the micro-wave and visible region

(3) the visible and ultraviolet region

(4) the ultraviolet and the X-ray region

Subtopic:  Properties of EM Waves |
 83%
From NCERT
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Consider an electric charge oscillating with a frequency of 10 MHz. The radiation emitted will have a wavelength equal to:

1. 20 m 2. 30 m
3. 40 m 4. 10 m
Subtopic:  Properties of EM Waves |
 89%
From NCERT
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Which of the following electromagnetic waves has minimum frequency?
1. Radio waves
2. Infrared waves
3. Microwaves
4. X-rays

Subtopic:  Electromagnetic Spectrum |
 70%
From NCERT
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A parallel plate capacitor consists of two circular plates each of radius 12 cm and separated by 5.0 mm. The capacitor is being charged by an external source. The charging current is constant and is equal to 0.15 A. The rate of change of the potential difference between the plates will be:

1. \(1.873 \times 10^7 \mathrm{~V} / \mathrm{s}\)
2. \(1.873 \times 10^8 \mathrm{~V} / \mathrm{s}\)
3. \(1.873 \times 10^9 \mathrm{~V} / \mathrm{s}\)
4. \(1.873 \times 10^{10} \mathrm{~V} / \mathrm{s}\)

Subtopic:  Displacement Current |
 60%
From NCERT
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A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100 W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 5 m from the lamp will be:
1. 1.34 V/m
2. 2.68 V/m
3. 4.02 V/m
4. 5.36 V/m

Subtopic:  Properties of EM Waves |
 60%
From NCERT
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A parallel plate capacitor consists of two circular plates each of radius 2 cm, separated by a distance of 0.1 mm. If the voltage across the plates is varying at the rate of 5×1013 V/s, then the value of displacement current is :

(1) 5.50 A

(2) 5.56×102 A

(3) 5.56×103 A

(4) 2.28×104 A

Subtopic:  Maxwell's Equations |
 64%
From NCERT
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In an electromagnetic wave, the direction of the magnetic field induction B is

(1) parallel to electric field E

(2) perpendicular to electric field E

(3) antiparallel to Poynting vector S

(4) random

Subtopic:  Properties of EM Waves |
 93%
From NCERT
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