Properties Of Em Waves

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

The velocity of electromagnetic radiation in a medium of permittivity ${\epsilon }_0$ and permeability ${\mathrm{\backslash mu}}_0$ is given by:

1. $\sqrt{\frac{{\mathrm{\epsilon }}_{\mathrm{o}}}{{\mathrm{\backslash mu}}_{\mathrm{o}}}}$

2. $\sqrt{{\mathrm{\backslash mu}}_{\mathrm{o}}{\mathrm{\epsilon }}_{\mathrm{o}}}$

3. $\frac{1}{\sqrt{{\mathrm{\backslash mu}}_{\mathrm{o}}{\mathrm{\epsilon }}_{\mathrm{o}}}}$

4. $\sqrt{\frac{{\mathrm{\backslash mu}}_{\mathrm{o}}}{{\mathrm{\epsilon }}_{\mathrm{o}}}}$

Which of the following statement is false for the properties of electromagnetic waves?

1.	Both electric and magnetic field vectors attain the maxima and minima at the same place and same time.
2.	The energy in the 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.

The electric and the magnetic fields, associated with an electromagnetic wave, propagating along the positive Z-axis, can be represented by:
1.
2.
3.
4.

The electric field associated with an electromagnetic wave in a vacuum is given by; where and are in volt/m, meter, and second respectively. The value of the wave vector is:
1.
2.
3.
4.

In an electromagnetic wave in free space, the root mean square value of the electric field is . The peak value of the magnetic field is:
1.
2.
3.
4.

An EM wave is propagating in a medium with a velocity . The instantaneous oscillating electric field of this EM wave is along the axis. The direction of the oscillating magnetic field of the EM wave will be along:

1.	direction	2.	direction
3.	direction	4.	direction

The magnetic field in a plane electromagnetic wave is given by:
${}_{}$
The wavelength is:
1.
2.
3.
4.

For a plane electromagnetic wave propagating in the -direction, which one of the following combinations gives the correct possible directions for the electric field and magnetic field respectively?

1.		2.
3.		4.

When light propagates through a material medium of relative permittivity, and relative permeability, the velocity of light, is given by: ( = velocity of light in vacuum)

1.		2.
3.		4.

In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of and amplitude . Then the amplitude of the oscillating magnetic field is: (Speed of light in free space )
1.
2.
3.
4.

The property which is not of an electromagnetic wave travelling in free space is that:

1.	the energy density in electric field is equal to energy density in magnetic field.
2.	they travel with a speed equal to
3.	they originate from charges moving with uniform speed.
4.	they are transverse in nature.

The electric field in a plane electromagnetic wave is given by Then expression for the corresponding magnetic field is (here subscripts denote the direction of the field):

1.
2.
3.
4.