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(C) In an electromagnetic wave $(EMW)$,the energy density associated with the electric field is $u_E = \frac{1}{2} \epsilon_0 E^2$ and the energy dens

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$1: 1$

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(C) In an electromagnetic wave $(EMW)$,the energy density associated with the electric field is $u_E = \frac{1}{2} \epsilon_0 E^2$ and the energy density associated with the magnetic field is $u_B = \frac{1}{2} \frac{B^2}{\mu_0}$.Since $E = cB$ and $c = \frac{1}{\sqrt{\mu_0 \epsilon_0}}$,we have $u_E = u_B$.Because the intensity of the wave is proportional to the energy density,the contributions of the electric field and magnetic field components to the total intensity are equal.Therefore,the ratio is $1:1$.

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

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