Question

Show that the average energy density of the electric field equals the average density of the magnetic field.
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Answer 1

Answer:

Hence, we found an expression for the energy charge density for a medium with an electric field inside it. Note: The term is ε0k is written as ε0k=ε, where is ε is called permittivity of the medium. Therefore, the energy density of a medium can be written as u=12εE2.