J. J. Thomson (1881) akaona kuti zvinhu zvine magetsi zvinonetsa kuita kuti zvifambe kupfuura zvinhu zvisina magetsi. Electrostatic fields behave as if they add an "electromagnetic mass" to the mechanical mass of the bodies. I.e., according to Thomson, electromagnetic energy corresponds to a certain mass. This was interpreted as some form of self-inductance of the electromagnetic field. He also noticed that the mass of a body in motion is increased by a constant quantity. Basa raThomson rakaenderera mberi uye rakagadziridzwa naFitzGerald, Heaviside (1888), naGeorge Charles Frederick Searle (1896, 1897). For the electromagnetic mass they gave <unk> in modern notation the formula <unk> Question: What is electromagnetic mass interpreted as?
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