Electromagnetic wave questions with solutions

Showing 1–10 of 99 questions

• MCQeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  The electric field and magnetic field components of an electromagnetic wave going through vacuum is described by Eₓ = E₀ sin (kz – ωt) Bᵧ = B₀ sin (kz – ωt) Then the correct relation between E₀ and B₀ is given by

  Options

  • Option A

    kE₀ = ωB₀

  • Option B

    E₀B₀ = ωk

  • Option C

    ωE₀ = kB₀

  • Option D

    E₀ = kB₀

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• NumericeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  The average intensity of a plane electromagnetic wave in vacuum is 12 W/m². If its average total electromagnetic energy density is N×10⁻⁸ J/m³, find N. Take c = 3×10⁸ m/s.

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• NumericeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  The electric field of an electromagnetic wave in vacuum is proportional to cos(4x - ωt), where x is in metres. If ω = N×10⁸ rad/s, find N. Take c = 3×10⁸ m/s.

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• MCQeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  Which statement about displacement current is correct?

  Options

  • Option A

    It requires actual charge carriers to cross the region

  • Option B

    It can exist in vacuum

  • Option C

    It is always zero between capacitor plates

  • Option D

    It is produced only by a constant electric field

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• NumericeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  A radio wave has frequency 100 MHz. If its wavelength in vacuum is N metres, find N. Take c = 3×10⁸ m/s.

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• MCQeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  Which charge definitely emits electromagnetic radiation?

  Options

  • Option A

    A charge permanently at rest

  • Option B

    A charge moving with constant velocity in a straight line

  • Option C

    An accelerating charge

  • Option D

    A charge having zero kinetic energy

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• MCQeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  In an electromagnetic wave, the instantaneous electric field magnitude is 9.3 V m⁻¹. The corresponding magnetic field magnitude is approximately:

  Options

  • Option A

    3.1×10⁸ T

  • Option B

    27.9×10⁸ T

  • Option C

    3.1×10⁻⁸ T

  • Option D

    18.6×10⁻⁶ T

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• MCQeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  A displacement current of 4.0 A is established between the plates of a 6 μF parallel-plate capacitor. If the rate of change of potential difference across the capacitor is α×10⁶ V·s⁻¹, what is the value of α?

  Options

  • Option A

    0.58

  • Option B

    0.67

  • Option C

    0.82

  • Option D

    0.75

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• MCQeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  A parallel-plate capacitor is being charged by a conduction current I. Neglect leakage. The displacement current between the capacitor plates is:

  Options

  • Option A

    0

  • Option B

    I

  • Option C

    I/2

  • Option D

    2I

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• NumericeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  The electric-field amplitude of an electromagnetic wave becomes three times its initial value while the medium remains unchanged. If the new average intensity is N times the original intensity, find N.

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