Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

In a conductor which of the following relations hold good?
A:
∇ x D = r
B:
∇ . D = r
C:
∇ x D = 0
D:
∇ . D = 0
Answer: C

Inside a conductor free charge is zero, hence, ∇ x D = 0.

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A parallel polarized wave is incident from air into paraffin having relative permittivity 3, the value of its Brewster angle is
A:
0°
B:
30°
C:
45°
D:
60°
Answer: D

Brewster angle θ = tan-1 .

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A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is
A:
10 watts
B:
1 watt
C:
0.1 watt
D:
0.01 watt
Answer: A

= 101 Pr = 10 watt.

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In a 100 turn coil, if the flux through each turn is (t3 - 2t)mWb, the magnitude of the induced emf in the coil at a time of 4 sec is
A:
46 mV
B:
56 mV
C:
4.6 V
D:
5.6 V
Answer: C

E = 100 (3t2 - 2) 100(46) 4600 mV

4.6 V.

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Calculate wave impedance for TE mode
A:
(377)Ω
B:
226 Ω
C:
∞
D:
629 Ω
Answer: D

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