Electromagnetic wave questions with solutions

Showing 1–10 of 194 questions

• MCQmediumElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  For a sinusoidal plane electromagnetic wave in vacuum having peak electric-field amplitude E₀, the average intensity is:

  Options

  • Option A

    cε₀E₀²

  • Option B

    ½cε₀E₀²

  • Option C

    ¼cε₀E₀²

  • Option D

    E₀²/(2cε₀)

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• MCQeasyElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  If the electric-field amplitude of a plane electromagnetic wave is doubled without changing the medium, its average intensity becomes:

  Options

  • Option A

    2I

  • Option B

    4I

  • Option C

    I/2

  • Option D

    8I

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• MCQmediumElectromagnetic wave

  Instantaneous displacement current of 1.0 A in the space between the parallel plates of 1μF capacitor can be established by changing potential difference of:

  Options

  • Option A

    10⁻⁶ V/s

  • Option B

    10⁶ V/s

  • Option C

    10⁻⁸ V/s

  • Option D

    10⁸ V/s

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• MCQeasyElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  Which kind of moving charge can produce a propagating electromagnetic wave?

  Options

  • Option A

    A stationary charge

  • Option B

    A charge-free particle

  • Option C

    An accelerating charge

  • Option D

    A charge moving at constant velocity

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• MCQmediumElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  A parallel-plate capacitor has horizontal plates. During charging, the upper plate is becoming positively charged and the lower plate is becoming negatively charged. The direction of the displacement current between the plates is:

  Options

  • Option A

    Vertically upward

  • Option B

    Vertically downward

  • Option C

    Radially outward

  • Option D

    It has no definite direction

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• MCQeasyElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  Which Maxwell equation is specifically required for time-varying magnetic conditions and reduces to the electrostatic form in static conditions?

  Options

  • Option A

    ∮D·dA = Q

  • Option B

    ∮E·dl = -dΦ(B)/dt

  • Option C

    ∮E·dl = 0

  • Option D

    ∮B·dl = μ₀I

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• NumericmediumElectromagnetic wave

  The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is B₀ = 510 nT. What is the amplitude (in N/C) of the electric field part of the wave?

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• MCQmediumElectromagnetic wave

  A plane electromagnetic wave travels in free space along x-axis. At a particular point in space, the electric field along y-axis is 9.3 V m⁻¹. The magnetic induction is:

  Options

  • Option A

    3.1 × 10⁻⁸ T

  • Option B

    3 × 10⁻⁵ T

  • Option C

    3.1 × 10⁻⁶ T

  • Option D

    9.3 × 10⁻⁶ T

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• MCQmediumElectromagnetic wave

  The electric field of a plane electromagnetic wave is E⃗=E₀(î+ĵ)/√2 cos(kz+ωt). At t=0, a positively charged particle is at (0,0,π/k). If its instantaneous velocity is v₀k̂, the force on it due to the wave is:

  Options

  • Option A

    Zero

  • Option B

    Parallel to (î+ĵ)/√2

  • Option C

    Antiparallel to (î+ĵ)/√2

  • Option D

    Parallel to k̂

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• MCQeasyElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  A plane electromagnetic wave enters a lossless non-magnetic dielectric of refractive index n. The ratio E₀/B₀ inside the medium is:

  Options

  • Option A

    c

  • Option B

    c/n

  • Option C

    nc

  • Option D

    1/(nc)

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