In free space, which of the following will be zero? - Electromagnetic Field Theory

Electronics and Communication Engineering (ECE) : Electromagnetic Field Theory - Quiz(MCQ)

In free space, which of the following will be zero?

A)

Conductivity

B)

Resistivity

C)

Permittivity

D)

Permeability

Correct Answer : Option (A) : Conductivity

Explanation : In free space, ε = ε0 and μ = μ0. The relative permittivity and permeability will be unity. Since the free space will contain no charges in it, the conductivity will be zero.

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Radiation intensity in a given direction is the

A)

Energy radiated per square metre

B)

Power radiated per square metre

C)

Power radiated per unit solid angle in that direction

D)

None of the above

Correct Answer : Power radiated per unit solid angle in that direction

Which of the following impedance inversion is obtained?

A)

Balun transformer

B)

A quarter wave line

C)

Short-circuited stub

D)

A half wave line

Correct Answer : A quarter wave line

The wave in wave guide has

A)

Larger frequency than in the free space

B)

Diminishing wavelength than in the free space

C)

Group velocity inversely proportional to wavelength

D)

Larger wavelength than in the free space

Correct Answer : Larger wavelength than in the free space

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