Electromagnetic theory miscellaneous

Electromagnetic theory miscellaneous

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Difficult Questions

Electromagnetic Theory

Electromagnetic theory miscellaneous
  1. An electromagnetic wave incident on a perfect conductor is—








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    An electromagnetic wave incident on a perfect conductor is entirely reflected.

    Correct Option: A

    An electromagnetic wave incident on a perfect conductor is entirely reflected.

  1. Poynting vector signifies—








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    Poynting vector signifies power density vector producing electromagnetic field.

    Correct Option: B

    Poynting vector signifies power density vector producing electromagnetic field.

  1. UHF and microwaves in the frequency range 300 MHz to 30 GHz can be best transmitted using—








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    Duct propagation.

    Correct Option: B

    Duct propagation.

  1. The velocity of electromagnetic waves in free space—








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    The velocity of electromagnetic waves in free space is independent of frequency.

    Correct Option: C

    The velocity of electromagnetic waves in free space is independent of frequency.

  1. The value of ∮ di along a circle of radius 2 units is— ƒ








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    ∮ dl is always zero whatever may be the closed path it is so because dl is an element of displacement displacement (not of simply length) and around a closed path is starting at one point and reaching back over there, net displacement is zero and hence ∮ dI = 0.

    Correct Option: A

    ∮ dl is always zero whatever may be the closed path it is so because dl is an element of displacement displacement (not of simply length) and around a closed path is starting at one point and reaching back over there, net displacement is zero and hence ∮ dI = 0.