Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

A plane EM wave is travelling in an unbound loss less dielectric having μy = 1 and εy = 4, the time average Poynting vector of the wave is 5 W/m3 . The phase velocity vp (assuming velocity of light as 3 x 108 m/sec) is
A:
1.5 x 108 m/sec
B:
3 x 108 m/sec
C:
2.5 x 108 m/sec
D:
0.5 x 108 m/sec
Answer: A
No answer description is available. Let's discuss.
The wave propagation occurs without attenuation in case of a
A:
conductor
B:
semiconductor
C:
perfect dielectric
D:
none of the above
Answer: C
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The numerical value of directive gain may lie between
A:
1 and + 1
B:
0 and 1
C:
0 and ∞
D:
1 and ∞
Answer: C
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Laplacian of a scalar function v is
A:
gradient of v
B:
divergence of v
C:
gradient of the gradient of v
D:
divergence of the gradient of v
Answer: D
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Antenna is a __________ element
A:
passive
B:
active
C:
resistive
D:
capacitive
Answer: A
No answer description is available. Let's discuss.
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