Abstract
Electromagnetic potentials and fields are found for arbitrary four-current densities in Friedmann universes. A choice of gauge is made so that the potentials are similar to the flat-space potentials. A formalism is developed which allows the construction of potentials and fields which are covariant with respect to spatial transformations. It is shown explicitly how these potentials are related to the flat-space potentials through conformal and gauge transformations. Some features of the solutions in the finite models are discussed with reference to problems of interpretation raised recently by Katz.

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