Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

Absolute permeability (μ) is given by __________ henry/metre
A:
4p x 10-12
B:
4p x 10-7
C:
8.854 x 10-12
D:
8.854 x 10-7
Answer: B
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T.V. broadcasting based on
A:
line of sight communication
B:
ionospheric propagation
C:
ground wave
D:
medium wave
Answer: B
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For a uniform plane wave of frequency 106 Hz propagating in a good conductor, the field undergoes a change in phase by 2p radius over a distance of 1 meter. The field is attenuated by a factor of 1/e at a distance of
A:
m
B:
m
C:
p m
D:
2p m
Answer: A
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In a horizontal polarized wave
A:
magnetic field is perpendicular to ground
B:
magnetic field component is parallel to ground
C:
electric field component is perpendicular to ground
D:
electric field is parallel to ground
Answer: D
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The "boundary sphere" between antenna region and free space region appears to "opaque"
A:
along the dipole axis
B:
along perpendicular direction
C:
along the dipole axis as well as perpendicular direction
D:
neither along the dipole axis nor along the perpendicular direction
Answer: A
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