Abstract
A manageable form of a problem put to Oliver Heaviside in 1916 is solved. A pair of concentric spheres, of radii a, b, and centre O, carry charges q and - q. A pole m moves along OX and gives rise to electric force in circles round OX. The pair of spheres experiences a resultant couple J, of axis OX. The pole experiences no couple. The force on the medium is d(VDB)/dt per unit volume, where D is electric displacement and B is magnetic induction. This force, like D, is null except between the spheres. The total couple due to it amounts to - J.
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