Electromagnetic Field Theory - Study Mode
[#91] Which of the following mechanisms is NOT for removing particulate matter from gas streams.
Correct Answer
(D) Burning the particulate
[#92] Polarization is characteristic of EM wave that gives the direction of
Correct Answer
(A) Electrical component of a wave with respect to ground
[#93] For a transmission of wave from a dielectric medium of permittivity ε 1 into a dielectric medium of lower permittivity ε 2 and (ε 1 > ε 2 ) the critical angle of incidence θ c (relative to the interface) is given by
Correct Answer
(A) $${sin ^{ - 1}}sqrt {frac{{{varepsilon _2}}}{{{varepsilon _1}}}} $$
[#94] A parallel plate capacitor of 100 pF having an air dielectric is charged to 10 kV. It is then electrically isolated. The plates are pulled away from each other until the distance is ten times more than before. Estimate the energy needed to pull the plates.
Correct Answer
(A) 0.05 Joules
[#95] The intrinsic impedance of free space is 377 Ω. The approximate intrinsic impedance of a medium with relative permittivity and permeability of 4 and 1 respectively will be
Correct Answer
(C) 188 Ω