The propagation constant γ for a material with μr = 1, εr = 8, σ = 0.25 pS/m and having the wave frequency of 1.6 MHz would be approximately equal to
What is the skin depth in copper at 10 GHz? Assuming conductivity of copper σ = 5.8 x 107 mhos/m and permeability equal to that of free space.
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The velocity of a plane wave in a lossless medium having a relative permittivity of 4 and relative permeability of unity would be
An elliptically polarized wave travelling in the +z direction in air has x and y components
Ex = 2 sin(ωt - βz) V/m;
Ey = 4 sin(ωt - βz + 75°) v/m
The average power per unit area conveyed by the wave is
Consider the following statements:
1. A wave whose phase is constant over a set of planes is called plane wave.
2. A wave whose phase is constant while magnitude is variable is called uniform plane wave.
3. The fields are non-uniform over plane surfaces.
4. Earth is considered as good conductor in one part of the radio frequency range and as dielectric in other frequency range.
Which of the above statements is/are not correct?
Assertion (A): Displacement current directly passes through the capacitor.
Reason (R): The current through a capacitive element is called displacement current.
In a homogeneous, isotropic, linear and stationary media, a plane electromagnetic wave has the following characteristics.
Assertion (A): The distance to which a wave penetrates a conductor is known as depth of penetration.
Reason (R): The depth of penetration (δ) is defined as that depth in which the wave has been attenuated to ‘e’ percent of its original value.
In a travelling electrom agnetic wave, E and H vector fields are
A wave is incident normally on a good conductor. If the frequency of a plane electromagnetic wave increases four times, the skin depth, will
The electric field of a travelling wave is given by 100 cos(109t - 4x). The velocity and the wavelength are respectively.
In a dielectric-conductor boundary (interface), the tangential component of electric field is
Which of the following statements is not true of waves in general?
When an EM wave is incident on a dielectric, it is
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I
A. Free space
B. Lossless dielectrics
C. Lossy dielectrics
D. Good conductors
List-lI
1. σ ≠ 0, ε = ε0εr, μ = μ0μr
2. σ = 0, ε = ε0, μ = μ0
3. σ ≈ ∞, ε = ε0, μ = μ0μr
4. σ = 0, ε = ε0εr, μ = μ0μr
Codes:
A B C D
(a) 4 2 3 1
(b) 2 4 1 3
(c) 4 2 1 3
(d) 2 4 3 1
Match List-I (EM phenomena) with List-ll (Uses) and select the correct answer using the codes given below the lists:
List - I
A. Cosmic rays
B. Ultraviolet radiation
C. Infra-red radiation
D. Gamma rays
List - II
1. Sterilization
2. Cancer therapy
3. Astronomy
4. Photography
Codes:
A B C D
(a) 4 3 2 1
(b) 3 4 1 2
(c) 1 2 3 4
(d) 3 1 4 2
A lossy dielectric has an intrinsic impedance of 200∠30° Ω at a particular frequency. If, at that frequency, the plane wave propagating through the dielectric has the magnetic field component
the skin depth will be
What is the major factor for determining whether a mediam is free space, lossless dielectric, or good conductor?