MAGNETISM - properties of magnets is change astound usage - Magnetic lines of force

MAGNETISM

The name magnet was given to a mineral found in magnesia in Asia-Minor. This mineral, a black oxide of iron had the strange property of attracting small pieces of iron. Substances like iron, steel, cobalt and nickel which are attracted by a magnet are called magnetic substances. Substances like wood, glass, and copper which are not attracted by a magnet are called non-magnetic substances.

The three properties of magnets is change astound usage

One of the familiar properties of magnets is that attractive. A magnet attracts substances like iron, cobalt and nickel. The magnet-concentrated ends are known as Poles. This property was turned into the invention of today’s huge grains.

The well-known property of a magnet is the North and South Pole direction property. Because earth magnetism is only that Poles. This thinking of humans by this property was used to invent a compass which is used to predict direction. This property is not only this usage it’s turned into inventing many devices which want to direction.

The one of best usage properties of magnets is induction. The property of magnetic induction was to change the total electricity production method. Nowadays all-electric generators are used by this property.

In 1820 Hans Christian Oersted discovered that a compass needle got deflected when an electric current passed through a metallic wire placed nearby. So he concludes that when current passes through any metal it also exerts a magnetic field.

Later Michel Faraday saw an article on Oersted’s magnetic field effect. He thought about that article how we turn into useful? He would like to do research from the revered order of Oersted which means when a magnetic field changes that will be induced current. Such research was great to reach to worldwide. Because of that research was useful to electricity generators.

Magnetic substances

Usually, magnets are three kinds of substances which differ from attraction, strong attraction and repulsion.

Diamagnetic substances

The substances get repelled when brought near a strong magnet. These substances are called dia magnetism. For instance, diamond, gold, silver etc.

Paramagnetic substances

The substance gets attracted toward the magnet when brought near a magnet. These are called as para-magnetic substances. For instance, platinum and aluminium etc.

Ferromagnetic substances

The substances get strong attraction when brought near a magnet. This is called as ferromagnetic substances. For instance, iron, nickel cobalt etc.

Artificial magnets

Natural magnets have weak attractive and directive properties and are irregular in shape. Stronger magnets having regular shapes can be made out of magnetic materials like steel, alnico etc., by artificial means and these are known as artificial magnets.

Permanent magnets

The magnetic substance is called as permanent magnets because they have high resistivity and temperature changes.

Magnetic lines of force

·       A line of force is a curve or the path along which a free isolated north pole would tend to travel when placed in the magnetic field.

·       Magnetic lines of force will crowd at the poles since magnetism is concentrated at the poles.

·       Lines of force due to a uniform magnetic field will be parallel to one another.

·       Lines of force will never intersect.

·       The null or neutral point in a magnetic field is a point at which the resultant magnetic intensity is zero.