Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

The ratio of tangential component of electric field at the surface of a conductor and the linear current density resulting from this field is __________ impedance
A:
characteristic
B:
critical
C:
surface
D:
polarizing
Answer: C
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If H = 0.1 sin (108p t + βλ) A/m for a plane wave propagating in free space, then the time average Poynting vector is
A:
(0.6psin2 βy) w/m2
B:
- 0.6p w/m2
C:
1.2p w/m2
D:
- 1.2p w/m2
Answer: D
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The effect of the inductance of a coil on a constant direct current is that
A:
it does not effect the constant direct current
B:
it decreases the current
C:
it strengthens the current
D:
it causes a higher voltage drop
Answer: A
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Radiation resistance of half-wave dipole (λ/2) antenna is in free space
A:
73 Ω
B:
120 p
C:
36.5 Ω
D:
70 Ω
Answer: A
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Intrinsic or characteristic impedance of free space has a value of
A:
120 ohm
B:
73 ohm
C:
73 ε ohm
D:
120 ε ohm
Answer: D
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