The ratio of electric-field and magnetic-field contributions to the intensity of an electromagnetic wave is:
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Question

The ratio of electric-field and magnetic-field contributions to the intensity of an electromagnetic wave is:

G1 Physics · Accepted Answer

Step 1: Electric energy density is uᴇ = ½ε₀E². Step 2: Magnetic energy density is uʙ = B²/(2μ₀). Step 3: Since E = cB and c² = 1/(ε₀μ₀), uᴇ = uʙ, so the ratio is 1:1 (option A). Final answer: (A) 1 : 1.