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WorksheetsEC8451 EMF - UNIT - V (PLANE ELECTROMAGNETIC WAVES)
Total questions: 30
Worksheet time: 30mins
If the amplitude of the magnetic field is 3 × 10−6 T, then amplitude of the electric field for a electromagnetic waves is
100 V m−1
300 V m−1
600 V m−1
900 V m−1
Which of the following electromagnetic radiation is used for viewing objects through fog
microwave
gamma rays
X- rays
infrared
Which of the following are false for electromagnetic waves
transverse
mechanical waves
longitudinal
produced by accelerating charges
Consider an oscillator which has a charged particle and oscillates about its mean position with a frequency of 300 MHz. The wavelength of electromagnetic waves produced by this oscillator is
1 m
10 m
100 m
1000 m
Electromagnetic waves do not transport
energy
charge
momentum
information
Electromagnetic waves ware transverse in nature is evident by
polarization
interference
reflection
diffraction
Speed of electromagnetic waves is same
for all wavelengths
in all media
for all intensities
for all frequencies
According to depth of penetration, what is the percentage proportion of attenuated wave w.r.t its original value?
17%
27%
37%
57%
In an electrical circuit,which nature of impedance causes the current & voltages in phase?
Reactive
Resistive
Capacitive
Inductive
If the magnetic field component of a plane wave in a lossless dielectric is H = 50 sin (2π x 106 t – 6x) az mA/m , what will be the wave velocity?
1.047 x 106 m/s
1.257 x 106 m/s
2.50 x 106 m/s
3 x 106 m/s
Which equations are regarded as wave equations in frequency domain for lossless media?
Maxwell's
Lorentz
Helmholtz
Poisson's
Which among the following exhibits perpendicular nature in TEM wave?
Electric field
Magnetic field
Direction of propagation
All of the above
In which kind of waveform is the phase velocity defined?
Sinusoidal
Rectangular
Square
Triangular
During the propagation of electromagnetic waves in a medium
electric energy density is double of the magnetic energy density
electric energy density is half of the magnetic energy density
electric energy density is equal to the magnetic energy density
both electric and magnetic energy densities are zero
Electromagnetic waves are produced by
accelerated charged particle
deaccelerated charged particle
charge in uniform motion
none of the above
All electromagnetic waves travel through a vacuum at
the same speed.
speeds that are proportional to their frequency.
speeds that are inversely proportional to their frequency.
None of the above.
The E and B fields in electromagnetic waves are oriented
parallel to the wave's direction of travel, as well as to each other.
parallel to the waves direction of travel, and perpendicular to each other.
perpendicular to the wave's direction of travel, and parallel to each other.
perpendicular to the wave's direction of travel, and also to each other.
An electromagnetic wave is radiated by a straight wire antenna that is oriented vertically. What should be the orientation of a straight wire receiving antenna? It should be placed
vertically.
horizontally and in a direction parallel to the wave's direction of motion.
horizontally and in a direction perpendicular to the wave's direction of motion.
None of the above.
An electromagnetic wave is traveling to the east. At one instant at a given point its E vector points straight up. What is the direction of its B vector?
north
down
east
south
Which of the following correctly lists electromagnetic waves in order from longest to shortest wavelength?
gamma rays, ultraviolet, infrared, microwaves
microwaves, ultraviolet, visible light, gamma rays
radio waves, infrared, gamma rays, ultraviolet
television, infrared, visible light, X-rays
What is the wavelength of light waves if their frequency is 5.0X1014 Hz?
0.60 m
6.0 mm
0.060 mm
0.60 micro-m
How long does it take light to travel 1.0 m?
3.3 ns
3.3 micro-s
3.3 ms
3.3 s
What is the wavelength of a 92.9 MHz radio wave?
32 mm
32 cm
3.2 m
32 m
What frequency are 20 mm microwaves?
100 MHz
400 MHz
15 GHz
73 GHz
Electromagnetic waves that include light belong to
light spectrum
electronic spectrum
electromagnet group
electromagnetic spectrum
For an electromagnetic wave incident from one medium to a second medium, total reflection takes place when
The angle of incidence is equal to the Brewster angle with E field perpendicular to the plane of incidence.
The angle of incidence is equal to the Brewster angle with E field parallel to the plane of incidence
The angle of incidence is equal to the critical angle with the wave moving from the denser medium to a rarer medium
The angle of incidence is equal to the critical angle with the wave moving from a rarer medium to a denser medium
A uniform plane wave in air is normally incident on an infinitely thick slab. If the refractive index of glass slab is 1.5, then the percentage of the incident power that is reflected from the air – glass interface is
0%
4%
20%
100%
Some unknown material has a conductivity of 106 mho/m and a permeability of 4𝜋×10−7 𝐻/𝑚. The skin depth for the material at 1 GHz
15.9 𝜇m
20.9 𝜇m
25.9 𝜇m
30.9 𝜇m
A plane electromagnetic wave propagating in free space is incident normally on a large slab of loss – less, non – magnetic, dielectric material with 𝜀 > 𝜀0. Maxima and minima are observed when the electric field is measured in front of the slab. The maximum electric field is found to be 5 times the minimum field. The intrinsic impedance of the medium should
120 𝜋 Ω
60 𝜋 Ω
600 𝜋 Ω
24 𝜋 Ω
When a plane wave traveling in free – space is incident normally on a medium having 𝜀𝑟 = 4.0, the fraction of power transmitted into the medium is given by
8/9
1/2
1/3
5/6
