Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ε = 80 ε0. The surface charge density on the conductor is ((ε0 = 10-9/36p)F/m)
A:
0 c/m2
B:
2 c/m2
C:
1.8 x 10-11 c/m2
D:
1.14 x 10-9 c/m2
Answer: D

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A plane wave is characterized by the wave is
A:
linearly polarized
B:
circularly polarized
C:
elliptically polarized
D:
unpolarized
Answer: C

Because, magnitude is different (0.5, 1) and phase is 90°

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A (75 - j 40) W load is connected to a co-axial line of z0 = 75ω at 6 MHz. The load matching on the line can be accomplished by connecting
A:
a short circuit stub at the load
B:
an inductance at the load
C:
a short circuit stub at a specific distance from the load
D:
a capacitance at a specific distance from the load
Answer: B

ZL = 75 - J . 40, ZC = 75 W, f = 6 mHz

Given ZL is capacitive, so proper matching, load must be inductive.

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Most antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base fed at a frequency of 600 kHz. The radiation resistance of the antenna in ohms is
A:
B:
C:
D:
20p2
Answer: C

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Calculate the directivity of an antenna for θE = 30°, θH = 60
A:
46
B:
23
C:
50
D:
100
Answer: B

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