The existence of a gravitational analog of the magnetic field is demonstrated very easily by considering a special case.

An examination of the origin of the torque on a magnetic dipole suspended above a line charge, as viewed from different frames of reference, provides insight into the nature of the dynamics of the magnetic interaction. In addition, it illustrates the remarkable unity of relativistic electromagnetic theory and points toward an intriguing interplay between geometry and dynamics.

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somewhat intangible outcome; the actual materials might then be regarded as of only incidental importance. Inevitably the tests and self-teaching materials must have a limited lifetime of applicability-as yet unknown-but experience in producing and using them is likely to make the provision of the next generation of such materials a simpler task. After all, the ultimate aim must be to make the school-university interfacing problems disappear.