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Question 20186
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Electromagnetic Waves and Wave Optics: Energy of EM Wave MCQ

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Energy of EM WaveEasyQuestion 20186

Question

Energy density of an EM wave is equally shared between:
  1. A
    Electric energy only
  2. B
    Magnetic energy only
  3. C
    Electric and magnetic energy equally
    Correct
  4. D
    Kinetic and potential energy

Correct answer

Electric and magnetic energy equally

Explanation

Average energy density u = ε₀E²(rms) = B²(rms)/μ₀. Both are equal: u_E = u_B. Total u = ε₀E²(rms) = B²(rms)/μ₀.

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