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Electromagnetic Field Theory

Electromagnetic Field Theory
The power gain of a half-wave dipole with respect to an isotropic radiator is

2.15 db
3 db
4.15 db
6 db

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Electromagnetic Field Theory
The potential that appears at a point in space due to the current which caused it is called potential

Accelerating
Lagging the current
Oscillating
Retardation

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Electromagnetic Field Theory
In free space E (z, t) = 103 sin(ωt - βz) uy v/m. What is the value of H (z, t)

 (103/377) cos(ωt - β z)(-ux) A/m.
 (103/377) sin(ωt - β z)(ux) A/m.
 None of above.
 (103/377) sin(ωt - β z)(-ux) A/m.

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Electromagnetic Field Theory
Whenever the magnetic flux changes with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s

 second law
 third law
 fourth law
 first law

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Electromagnetic Field Theory
XEROX machine is working on

 magnetic effect.
 electrostatic effect.
 heating effect of current.
 peltier effect.

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Electromagnetic Field Theory
If in a 1 mF capacitor, an instantaneous displacement current of 1 A is to be established in the spaces between its plates then it is possible by applying

 106 Amp/sec.
 106 volts.
 106 Amp.
 106 volts/sec.

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