Terms, Definitions, MCQs and Free Templates
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The important postulate arising out of Maxwell’s modification of Ampere’s law is
The divergence of a vector is a scalar, while the curl of a vector is another
What will happen to a bird sitting on a conductor?
Which of the following does not characterize a ferromagnetic material?
One volt equals
The direction of vectors gives the direction of propagation of electromagnetic waves
Δ2V = – r/E is known as __________ equation
A medium is said to be isotropic when
The absorption of radio waves by atmosphere depends on
Electric lines of force do not cross each other because
Poynting vector is the rate of energy flow having
When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .
The wave propagation occurs without attenuation in case of a
Surface impedance at high frequencies is a consideration for
An electron (charge -e) is rotating in a circular orbit of radius R, around a proton with charge +e at a constant angular velocity ω. The orbital magnetic dipole moment is
The polarization of dielectric materials results in
An electromagnetic wave incidents on a perfect insulator at an angle. If the wave is not entirely parallel polarized, then
Which of the following waves do not exist in waveguides?
Which of the following statement is incorrect?
For a core having a relative permeability μr, magnetic dipole moment per unit volume M and field strength H, the flux density B is
When there is rapid attenuation of field inside the conductor, the field current are concentrated close to the surface of the conductor; this phenomenon is called
If ωε is the displacement current factor and s is conduction current density factor then which of the following statements is incorrect?
For a good conducting medium the intrinsic impedance is
In a perfect conductor the incident and reflected wave combine to produce
In a homogeneous magnetic field H of a solenoid, the core carries a magnetic dipole moment M per unit volume equal to
The electric intensity for free space is given by
Brewster angle is the angle for which there is
In waveguides the existing waves are
Intrinsic or characteristic impedance of free space has a value of
Which of the following statements is incorrect?
The useful magnetic flux obtainable from any closed surface is
In a medium if ε, μ and σ are constant throughout the medium, then it is known as
When an electromagnetic wave travelling in one medium strikes upon a second medium (having a different conductivity) the wave will be
Power gain of an antenna in a given direction is the ratio of
A square corner reflector is used in which of the following?
For frequencies upto 1650 kHz __________ antenna is used
Which of the following is a circularly polarized antenna?
UHF and microwaves in the frequency range 300 MHz to 30 GHz can be best transmitted using __________ propagation
An antenna having a high Q has
For a plane good conductor, skin depth varies