1.

Let u_(a) and u_(d) represent the energy density (energy per unit volume) in air and in a dielectric respectively, for the same field in both. Let K= dielectric constant. Then

Answer»

`u_(a)=u_(d)`
`u_(a)=Ku_(d)`
`u_(d)=Ku_(a)`
`u_(a)=(K-1)u_(d)`

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