Definition of magnetic needle
: a bar magnet or a set of bar magnets so suspended as to indicate the direction of the magnetic field in which it is placed; especially : such a magnet that is slender and pointed at the ends and used as a compass
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MAGNETIC NEEDLE Defined for Kids
Definition of magnetic needle for Students
: a narrow strip of magnetized steel that is free to swing around to show the direction of the earth's magnetic field The magnetic needle in a compass always points north.
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