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These are the substances in which the generated magnetic field is in the direction of the charged magnetic field. Hence the magnetic tendency of these substances is also positive and its value is much higher than 1. If these substances are placed in the outer magnetic field then they themselves become magnetized. Examples are iron, steel, nickel, cobalt etc.

Curie heating

When a ferrous magnetic substance is heated, such a heat comes when its iron turns into magnetism in situ. This heat is called curie heating. The values ​​of curie heat for iron and nickel are 770 degrees Celsius and 358 degrees Celsius respectively.

Soft iron and steel

The soft iron quickly becomes a magnet and its magnetism ends soon.

That is why soft iron is used to make temporary magnets. Electromagnets are made of soft iron. The use of soft iron is used in electric dhoti, transformer crod, dynamo etc.

On the contrary, the steel makes a magnet from hardness and hardly leaves its magnetism. Hence steel is used to make permanent magnet. For example, permanent speakers of loudspeakers, duxuchak, galvanometer etc. are made of steel only.


Each magnet has a dashiic character, according to which if a magnet is tied to its gravity center and hangs in such a way that it can move freely in the horizontal plane, then we see that it always stays in the north-south direction. is. The reason for this is that our earth behaves like a big magnet. It is believed that a huge rod magnet is placed on the center of the earth, whose southern pole is located toward the Earth’s geographic north pole and the North Pole is located towards the Earth’s geographical southern pole. The lines of the earth’s magnetic field are at equal distances and are parallel and are pointed towards the north.

In some place on Earth, the magnetic north is usually not in the exact geographic north direction. The angle between these two directions is called Dikat. That is why, in order to find the right north direction by sailors and others in ocean voyage, the use of compass is required to be run. The horizontal angle, which is formed independently by the hanging rod magnet, is called the root of the place. Thus, this tendency is the Naman from the horizon that is called the magnetism of that place. Naman on zero and pole poles have 90 degrees of cellulose on the equator.

Magnetism: All the above properties of magnet are called magnetism due to the state of magnetism.

Magnetic field

The area around a magnet, in which the second magnet experiences the force of attraction or repulsion, is called the magnetic field of that magnet. The direction of the magnetic field is determined by the magnetic needle. The symbol of the magnetic field is the Gauss.

Magnetic field and electric current

In 1820, Danish scientist Orsted discovered the magnetic field around a conductor in which the electric current was flowing. They placed a magnetic needle near a conductor wire and saw that until the stream did not flow in the wire, the direction of the needle is parallel to the wire. But as soon as the stream is flowing in the heat by pressing the key, the magnetic needle starts deflecting from its normal position. As the value of the stream increases in the wire, the dislocation of the needle also increases. Hence, the experiment concludes that there is a magnetic field around a cyclonic conductor.

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