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'Three Formulations if ElectrodynainicsDomina-Eberle Spencer. University of Connecticut. Storrs CYShama Y. Uma. Bridgewater State College, Bridgewater MAPhillip J.Mann, University of Connecticut, Storrs CT^rTThe paper discusses the three forms of eiectrodynamic equationswhich are believed by some modern physicists: the Weber equation, theclassical equation, and the new relative velocity formulation. It is shownthat only one of these formulations can possibly predia the tangential forceswhich have been observed in many experiments and the Edwards effect.Many different equations for the force between moving charges havebeen proposed --3. But at low velocities only three of these are distinct andhave modern adherents.The oldest equation is that suggested by Wilhelm Weber'^ in 1848.This equation is seriously considered by Wesley^. Marinov^. (3raneau^,Papas^ and Phipps^. The Weber equation can be derived^ from a scalarpotential which is a function of the relative velocitv of source and receiver.Consider a charge Q which is in motion at velocitv v. Fig. 1, in a non-rotatingcoordinate system in which the force on a test charge at point P is to bemeasured. The distance between source and receiver is r. A unit vector arpoints from source to receiver. The test charge at point P moves withvelocity u. Expressed in the mks system the Weber scalar potential is(v- u)4ne„ r ^ 'a . .. .^jj