Magnet and MagnetismPublished on 22/10/2018 and last updated on 23/10/2018
Magnet and Magnetism are utilized for operating all kinds of electrical machines. Hence we should have a deep concept of magnets and magnetism. The property of a magnet is called magnetism. The magnet is an element which can attract magnetic materials. Normally a magnet can attract iron, cobalt, steel, nickel. If a magnetic piece is made free to rotate, it will always align along north and south.Please Rate this Article
Magnetic PolesThe magnetic strength of a magnet is maximum at a point nearer to the ends of the magnet. These points of a magnet are called magnetic poles. Each magnet does have two poles and these are the north pole and south pole. If we hang a magnet freely one magnetic pole will face towards the north and another pole will face towards the south. The pole faces north is called the north pole and the pole faces south is known as the south pole. Generally, the north pole and south pole are denoted by N and S respectively.
Magnetic MaterialsFerro Magnetic Materials: these materials are strongly attracted by a magnet. The examples of Ferromagnetic materials are iron, steel, nickel, cobalt, some metallic alloys. The relative permeability of these materials is very high. Para Magnetic Materials: these materials are attracted by a magnet but not very strongly. The examples of paramagnetic materials are aluminum, tin, platinum, magnesium, manganese etc. The relative permeability of these materials is slightly more than one. Dia Magnetic Materials: these materials are not at all attracted by any magnet. The relative permeability of these materials is less than one. The examples of diamagnetic materials are zinc, mercury, lead, sulfur, copper, silver etc.
Properties of Magnets
- Magnet always attracts magnetic materials.
- Magnet always tries to align along north and south.
- Similar magnetic poles repulse each other.
- If a magnet is heated, or hammered the magnet can lose its magnetism.
- If a magnet is divided into many pieces each of the pieces behaves as a complete magnet.