Force on a conductor
When a current passes through a conductor, a magnetic field is produced. When this conductor is passed through another magnetic field, they react depending on the direction of current flow. The use of Fleming's left hand rule is used to determine the direction that the conductor will travel in. The principle forms the fundamental beginnings of understanding how an electrical induction motor works.
Questions on force on a conductor appear in the 2330-202, 2330-203, 2330-301 and the 2357-309 exams.
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Where would a two way and intermediate lighting circuit be used?
Any room that had several entrances would use this type of circuit. It can also be used in longer corridors and on many flights of stairs so the lights can be switched off on any level.