A magnet is an object that attracts or repels other magnetic materials, such as objects made of iron, cobalt and nickel, with its magnetics field. Like poles of a magnet repel and opposite poles of a magnet attract each other. The region surrounding a magnet, in which the force of magnet can be detected is said to have a magnetic field. A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. The magnetic effect of electric current is known as electromagnetic effect. It is observed that when a compass is brought near a current carrying conductor the needle of the compass gets deflected because of flow of electricity. This shows that electric current produces a magnetic effect. Examples of magnetic force are a compass, a motor, the magnets that hold stuff on to the refrigerator, train tracks and so on. All moving charges give rise to a magnetic field and the charges that move through its regions, experience a force.

Dency Varghese

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