Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

The potential that appears at a point in space due to the current which caused it is called potential
A:
accelerating
B:
retardation
C:
oscillating
D:
lagging the current
Answer: B
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Which of the following statement regarding waveguides is incorrect?
A:
At waveguide can be coupled to a coaxial cable
B:
At frequencies below the cut off value the wave progresses across the waveguide after total reflections
C:
Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves
D:
Waveguides can handle large power at UHF and microwaves
Answer: A
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Parabolic and lens antenna used at
A:
microwave frequency
B:
medium frequency
C:
low frequency
D:
high frequency
Answer: A
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If ωε is the displacement current factor and s is conduction current density factor then which of the following statements is incorrect?
A:
For a lossless dielectric σ = 0
B:
For an imperfect dielectric σ = 0
C:
For a dielectric ωε >> σ
D:
For a semiconductor ωε = σ
Answer: B
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The capacitance between two spheres, whose separation is very much larger than their radii R, is given approximately as
A:
B:
2pε0R
C:
D:
none of the above
Answer: B
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