The rms value of the electric field in an electromagnetic wave is E_rms = 600 V/m.The average energy density of this wave is approximately A)0.796 $\mu$J/m³ B)1.59 $\mu$J/m³ C)3.18 $\mu$J/m³ D)6.78 $\mu$J/m³ E)5.21 $\mu$J/m³

Question

Quizplus · Accepted Answer

The average energy density, u, of an electromagnetic wave is given by u = (1/2) * e0 * E^2, where e0 is the permittivity of free space and E is the electric field amplitude. Plugging in the given values, we get u = (1/2) * 8.85 x 10^-12 F/m * (600 V/m)^2 = 1.59 x 10^-13 J/m^3. Thus, the answer is choice B.

The Rms Value of the Electric Field in an Electromagnetic μ\muμ

The Rms Value of the Electric Field in an Electromagnetic $\mu$