To study the effect produced on magnetic field pattern by bringing various materials in the surrounding space of a bar magnet.
Magnetism is the force that is exerted by magnets when they attract each other by the motion of electric charges. It can also be produced by current. The current carrying wire, or a charged particle contains magnetic force. It is produced by moving electric charge, which means the electrons move around in certain ways to create a magnetic field. Basically, magnetism is the magnetic fields and the effects of matter, which means the moving and attracting charges of magnetic objects. The magnetic force is the best evidence for the presence of magnetic field that means the charges moving in the field. For example, of the bar magnet the field starts from the north pole to the south pole and the force between the north to south is called attractive force. Generally magnetic fields are measured in the units of Tesla (T).
A non – magnetized magnetic material such as iron, steel and nickel that can contact with permanent magnet and produce a temporary magnetism is known as Induced magnetism. Example iron, steel, nickel. It is always attracted by permanent magnets. In the case of iron, the electrons spin in the same direction, so the atoms of these substances have a strong magnetic force. Moreover, based on these properties, iron acts as an induced magnet when placed in a magnetic field.