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A free test particle in 5-dimensional Kaluza-Klein spacetime will show itselectricity in the reduced 4-dimensional spacetime when it moves along thefifth dimension. In the light of this observation, we study the coupling of a5-dimensional dust field with the Kaluza-Klein gravity. It turns out that thedust field can curve the 5-dimensional spacetime in such a way that it providesexactly the source of the electromagnetic field in the 4-dimensional spacetimeafter the dimensional reduction.Comment: 8 pages, three references adde

FIVE-DIMENSIONAL KALUZA–KLEIN THEORY WITH A SOURCE