Question: Q. 5. The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is (a) c:1. (b) c2:1. (c) 1:1. (d) c:1.

[NCERT Exemplar]

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Solution:

Ans. Correct option : (c)

Explanation: Average energy by electric field E0 is Uav

=12ε01μ0ε0(B0)2c2=1μ0ε0  Ratio =(Uav) electric field (Uav) magnetic field =11, i.e., 1:1



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