As a child, you must all have played with a magnet. It is a material that attracts iron or ferrous objects. Chromium and Nickel are the other two objects that are attracted to magnets. Later when the characteristics of a magnet were discovered it was found that in the magnet there exist two poles at both ends. One pole is known as the north pole and the other is the south pole. In later days it also has been discovered that the electric when passing through a metal wire also possesses characteristics of magnetism in it. And if the wire is turned in a form of spring or selenium and electric current is passed through it then the spring behaves like an actual magnet. The north pole and south pole of this type of magnet can be easily identified by the use of a compass.
The magnetic force of any normal magnet or an electromagnet can be represented by magnetic lines. These magnetic lines originate from the north pole of the magnets and end at the south pole of the magnet completing a closed circuit through the body of the magnet. When a ferrous object is brought near a magnetic object then it also behaves like a magnet. The quality of magnetic property of such a magnet depends on the number of magnetic lines of force passing through this object that originate from the actual magnet. The measurement of the quantity of the magnetic force experienced by any object is measured by the magnetic lines of force entering and exiting it. The term used to describe this measurement is known as magnetic flux.
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