Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

The statement that the line integral of magnetic field about any closed path is exactly equal to the direct current enclosed by that path, is known as
A:
Ampere's circuital law
B:
Coulomb's law
C:
Electrostatic's theory
D:
None of the above
Answer: A
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In a four element Yagi-Uda antenna
A:
there is one driven element, one director and two reflectors
B:
there is one driven element, two directors and one reflector
C:
there are two driven elements, one director and two reflectors
D:
all the 4 elements are driven element
Answer: B
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A long periodic antenna is a
A:
frequency independent antenna
B:
frequency dependent antenna
C:
directional antenna
D:
none of the above
Answer: A
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The effective height of an antenna is slightly greater than physical height because
A:
wave velocity in conductor is less than its velocity in free space
B:
wave velocity in conductor is more than its velocity in free space
C:
resistance of conductor is less than that of free space
D:
none of the above
Answer: A
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Induction and radiation fields are equal at a distance equal to
A:
B:
6λ
C:
D:
Answer: D
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