Abstract
Summary Existing rules for calculating induced e.m.f. are examined and a nonrelativistic expression is developed for the force on a charged particle moving in the vicinity of a time-varying but stationary source of magnetic field. This expression is used to predict the e.m.f. induced in three basic electromagnetic devices. The controversial experiment in which a long cylindrical permanent magnet is rotated about its axis of symmetry is discussed, together with a new experiment of this type which suggests that, although the field may be regarded as rotating, this does not, in itself, provide any indication as to the location of the seat of the e.m.f. in closed circuits.
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