Electromagnetic theory miscellaneous


Electromagnetic theory miscellaneous

Electromagnetic Theory

  1. The vector H in the far field of an antenna satisfies—









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    H = ∇ × A
    ∴ ∇ × H = ∇ × (∇ × A) = 0
    ∇. H = ∇. (∇ × A) = 0

    Correct Option: C

    H = ∇ × A
    ∴ ∇ × H = ∇ × (∇ × A) = 0
    ∇. H = ∇. (∇ × A) = 0


  1. The polarization of wave with electric field vector E = E0 ej zωt + βz) (ax + ay) is—









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    Given E = E0 ej (ωt – βz) [ax + ay]
    [As only space quadrature and no time quadrature]
    Hence the polarization is linear.

    Correct Option: A

    Given E = E0 ej (ωt – βz) [ax + ay]
    [As only space quadrature and no time quadrature]
    Hence the polarization is linear.



  1. The wavelength of a wave with propagation constant (0.1 π + j 0.2 π) m– 1 is—









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    On comparing, given equation
    γ = 0.1 π + j 0.2 π with
    standard equation γ = α + jβ
    β = 0.2 π
    Now,

    λ =
    2∏
    =
    2∏
    = 10 m
    β .2∏

    Correct Option: B

    On comparing, given equation
    γ = 0.1 π + j 0.2 π with
    standard equation γ = α + jβ
    β = 0.2 π
    Now,

    λ =
    2∏
    =
    2∏
    = 10 m
    β .2∏


  1. All transmission line sections in figure shown below has a characteristic impedance, R0 + j0. The input impedance Zin equals—









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    NA

    Correct Option: B

    NA



  1. Match the following:
    1. Wave tilt
    2. Faraday rotation
    (A) Under-water propagation
    (B) Ground wave propagation
    (C) Space wave propagation
    (D) Ionospheric propagation









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    NA

    Correct Option: D

    NA