1.

Show that the avearge energy density of the electric field vecE equals the average energy density of the magnetic field vecB, in electromagnetic waves.

Answer»

SOLUTION :`mu_e=1/2e_0E^2 & u_B=1/2 B^2/mu_0`
`mu_E=1/2E_0E^2=1/2 e_0(CB)^2 As c=E/B`
`=1/2 e_0 B^2/(mu_0e_0) c=1/sqrt(mu_0E_0)`
`=B^2/(2mu_0)`
`mu_B`


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