Magnetism

​See how each pin turns into a magnet itself attracting the other pin

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Induced magnetism, Magnetic field of earth. Neutral points in magnetic fields. Magnetism: magnetism induced by bar magnets on magnetic materials; induction precedes attraction; lines of magnetic field and their properties; evidences of existence of earth’s magnetic field, magnetic compass. Uniform magnetic field of earth and non-uniform field of a bar magnet placed along magnetic north-south; neutral point; properties of magnetic field lines. 

The magnetism acquired by a magnetic material when it is kept near (or in contact with) a magnet, is called induced magnetism.

The process in which a piece of magnetic material acquires the magnetic properties temporarily in presence of another magnet near it is called the magnetic induction.

When a piece of iron is placed near or in contact with a magnet, the piece of iron becomes a magnet i.e., it acquires the property of attracting iron filings when they are brought near its ends. Thus, a piece of iron behaves as a magnet as long as it is kept near (or in contact with) a magnet.

​Magnetic Induction

The magnetic field due to a magnet is represented by magnetic lines of force

Magnetic field lines emerge from the north pole and merge at the south pole.

As the distance between the poles increases, the density of magnetic lines decreases.

The direction of field lines inside the magnet is from the South Pole to the North Pole. Magnetic lines do not intersect with each other.

The strength of the magnetic lines is the same throughout and is proportional to how close are the lines.

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• A neutral point is a point at which the resultant magnetic field is zero. In general, the neutral point is obtained when the earth's magnetic field is balanced by the magnetic field of a magnet.

When North pole faces the Geographical North pole

When the South pole faces the Geographical North pole