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Principles of Electrical Engineering

A Comprehensive Work Covering the Principles of Heavy-current and Light-current Engineering Practice: Also Covering the Requirements of the B. Sc. (engineering), A.M.I.E.E., and Higher Examinations in this Subject

These two points are termed the " poles " of the magnet and the strength of each
pole is said to be in units. If two different bar magnets have, respectively, pole
strengths ml and to2, then the force which will act between the poles of the two ...