The velocity of electromagnetic radiation in a medium of permittivity ε0 and permeability μ0 is given by:

1. εoμo

2. μoεo

3. 1μoεo

4. μoεo

Subtopic:  Properties of EM Waves |
 91%
From NCERT
NEET - 2008
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The magnetic field amplitude of an electromagnetic wave is 2×10-T. Its electric field amplitude if the wave is travelling in free space is:

1. \(6~\mathrm{Vm^{-1}}\)

2. \(60~\mathrm{Vm^{-1}}\)

3. \(\frac{10}{6}~\mathrm{Vm^{-1}}\)

4. None of these

Subtopic:  Properties of EM Waves |
 90%
From NCERT
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A plane electromagnetic wave travels in free space along x-axis. At a particular point in space, the electric field along y-axis is 9.3 Vm-1. The magnetic induction is:

1. 3.1×10-8 T

2. 3×10-5 T

3. 3×10-6 T

4. 9.3×10-6 T

Subtopic:  Properties of EM Waves |
 90%
From NCERT
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Which statement is incorrect?

1.  Speed of light in free space \(=\frac{1}{\sqrt{\mu_0 \epsilon_0}}\) 
2.  Speed of light in the medium \(=\frac{1}{\sqrt{\mu \epsilon}}\)
3. \(\frac{E_0}{B_0}=c\)
4. \(\frac{B_0}{E_0}=c\)

Subtopic:  Properties of EM Waves |
 89%
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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The velocity of electromagnetic wave is parallel to:

1. B×E

2. E×B

3. E

4. B

Subtopic:  Properties of EM Waves |
 87%
From NCERT
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Select the correct option based on statements:
I:  Light can travel in vacuum but sound cannot do so.
II: Light is an electromagnetic wave and sound is a mechanical wave.

1. Both I and II are true and II is the correct explanation of I.
2. Both I and II are true but II is not the correct explanation of I.
3. I is true but II is false.
4. I is false but II is true.
Subtopic:  Properties of EM Waves |
 82%
From NCERT
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The electric and the magnetic field, associated with an electromagnetic wave, propagating along the +z-axis, can be represented by:

1. \(\left[\mathrm{E}=\mathrm{E}_0 \widehat{\mathrm{k}}, \mathrm{B}=\mathrm{B}_0 \hat{\mathrm{i}}\right]\)
2. \(\left[\mathrm{E}=\mathrm{E}_0 \widehat{\mathrm{j}}, ~\mathrm{B}={\mathrm{B}_0} \hat{\mathrm{j}}\right]\)
3. \(\left[\mathrm{E}=\mathrm{E}_0 \widehat{\mathrm{j}}, ~\mathrm{B}={\mathrm{B}_0} \hat{\mathrm{k}}\right]\)
4. \(\left[\mathrm{E}=\mathrm{E}_0 \widehat{\mathrm{i}}, ~\mathrm{B}={\mathrm{B}_0} \hat{\mathrm{j}}\right]\)

Subtopic:  Properties of EM Waves |
 83%
From NCERT
NEET - 2011
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The electric and magnetic fields of an electromagnetic wave are:

1. In phase and parallel to each other
2. In opposite phases and perpendicular to each other
3. In opposite phases and parallel to each other
4. In phase and perpendicular to each other

Subtopic:  Properties of EM Waves |
 84%
From NCERT
AIPMT - 2007
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Which of the following statements is false regarding the properties of electromagnetic waves?

1. Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time
2. The energy in an electromagnetic wave is divided equally between electric and magnetic vectors 
3. Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave
4. These waves do not require any material medium for propagation
Subtopic:  Properties of EM Waves |
 85%
From NCERT
NEET - 2010
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