PHYS 1010 Lecture Notes - Lecture 17: Galvanometer, Electromagnet, Time-Lapse Photography
3 Nov 2016
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Document Summary
Comes from the name magnesia: a coastal district of ancient thessaly, greece. First used as a compass and used for navigation by the chinese in the 12th century. The force between two charged particles depends on the size/magnitude of the charge and the distance of separation. There is force due to motion of charged particles: magnetic force. Force of attraction or repulsion between a pair of magnets depends on which end of the magnet is held near the other. Strength of interaction depends on the distance between the two magnets. Can"t have one pole without the other. No single pole is known to exist. Region of magnetic influence surrounding magnetic poles. Shape revealed by lines that spread from one pole to the other. By convention, direction is from the north pole tp the south pole, produced by motion of electrons. Strength indicated by the closeness of the lines. Lines close together = strong magnetic field.
