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Question 20185
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Electromagnetic Waves and Wave Optics: EM Waves — E and B Relationship MCQ

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EM Waves — E and B RelationshipEasyQuestion 20185

Question

In an electromagnetic wave, the ratio E/B equals:
  1. A
    ε₀/μ₀
  2. B
    c (speed of light)
    Correct
  3. C
    f/λ
  4. D
    μ₀/ε₀

Correct answer

c (speed of light)

Explanation

E = cB. The amplitudes of the electric and magnetic fields are related by E₀/B₀ = c = 1/√(μ₀ε₀). This comes from Maxwell's equations for plane waves.

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