Which of the following laws of electromagnetic theory is associated with the force experienced by two loops of a wire carrying currents?
The intrinsic impedance of free space
To couple a coaxial line to a parallel to wire line it is best to use a
The shunt admittance of a transmission line is given by
A dipole antenna was radiating with some excitation in free space radiating a certain amount of the power. If this antenna is immersed in a lake where water is non-dissipative but has a dielectric constant of 81, the radiated power with the same excitation will
If short-circuited and open circuited impedances are 5 ohms and 20 ohms, then characteristic impedance is
Electric lines of force do not cross each other because
A person with a receiver is 5 km away from the transmitter. What is the distance that this person must move further to detect at 3 dB decrease in signal strength?
For free space propagation
SHF range is
For an ideal antenna, numerical value of directivity must be
The force in a magnetic field is given by F = qvB
An electromagnetic wave is incident normally on a dielectric boundary. It is
According to maximum power transfer theorem, if the load is inductive, the source should be
According to Siegel and Labus, antenna can be treated as
Given figure shows a 90º sector of spherical reflector with vertex 'V', centre of curvature 'C' and equal distances VD, DF, FE and EC. When a beam of EM wave is incident parallel to the axis, all the energy will pass through the region
Self impedance is
The value of susceptibility in case of vacuum is taken as
Equipotential surfaces about a point charge are in which one of the following forms?
__________ will have the least value of relative permeability.
The relative permeability is taken as unity for which of the following?
The disturbance from adjacent power lines is known as
Which of the following term applies to troposcatter propagation?
Magnesium is alloyed with conducting materials for antenna primarily with the purpose of
Two co-axial cylindrical sheets of charge are present in free space fs = 5 c/m2 at r = 2 m and rs = -2 c/m2 at r = 4 m, The displacement flux density at r = 3 m is