For an electromagnetic wave propagating in vacuum, find the ratio of magnetic-field amplitude to electric-field amplitude.
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Question

For an electromagnetic wave propagating in vacuum, find the ratio of magnetic-field amplitude to electric-field amplitude.

G1 Physics · Accepted Answer

Step 1: For a travelling plane electromagnetic wave, magnitudes satisfy E₀ = cB₀. Step 2: Therefore B₀/E₀ = 1/c, a reciprocal speed. Step 3: Correct choice: B. Final answer: (B) 1/c.