Ans. The influence of a magnet is supposed to extend in all directions indefinitely, however, the effect is very slight beyond a comparatively limited area.
Magnetic Force.—This is the force with which a magnet attracts or repels another magnet or any piece of iron or steel. The force varies with the distance, being greater when the magnet is nearer and less when the magnet is farther off. The following are the laws relating to magnetic force:
1. Like magnetic poles repel one another; unlike magnetic poles attract one another.
2. The force exerted between two magnetic poles varies inversely as the square of the distance between them.