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In a plane e.m. wave, the electric field oscillates withe amplitude 20Vm^-1. Find (a) energy density of electric field (b) energy density of magnetic field.

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Answer Text

Answer :
`(a) 8.55xx10^(-10)J//m^3 (b) 8.55xx10^(-10)J//m^3`
Solution :
(a) Average energy density of electric field, <br> `u_E=1/2in_0E_(rms)^2=1/2in_0((E_0)/(sqrt2))^2=1/4in_0 E_0^2` <br> (b) Average energy density of magnetic field <br> `=(B_(rms)^2)/(2mu_0)=((B_0//sqrt2)^2)/(2mu_0)=1/4 (B_0^2)/(mu_0)=1/4 in_0E_0^2`

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