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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 5
36.
Select the correct relation
∇(AB) = A ∇ B + B ∇ A
∇ . (AB) = ∇ A . B + A ∇ B
∇ x (AB) = ∇ A x B + A ∇ B
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Diffraction of electromagnetic wave
is caused by reflection from the ground
may occur around the edge of a sharp obstacle
arises only with spherical wavefronts
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Power gain of antenna equals directive gain in VHF and UHF range if and only if efficiency of the antenna is
0.25
0.5
0.75
1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
For radiation field of an antenna at a distance r varies as
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
For a plane good conductor, skin depth varies
directly as square root of permeability
directly as square root of frequency
inversely as permittivity
inversely as square root of conductivity
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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