Experiment: Preparation of an Artificial Magnet by Electric Method
A magnet produced by cast iron, nickel, and the alloy of iron is called artificial magnet. The magnets which are used in the laboratories are artificial magnets. Their characteristic is this that they are of regular shape. In industries and scientific works, artificial magnets are used. Their magnetism is very strong. They are generally used in industrial and used electronics. For example, in large electric motors, microphones, loudspeakers, electric guitar pickups and microwaves.
A straight steel bar NS is taken and it is inserted horizontally inside a glass tube RQ. Then the insulated copper wire is wrapped around the glass tube (Figure) and the two ends of the wire is connected through a key to the two terminals of a battery. If by closing the key current is allowed to flow, then the bar becomes a magnet.
The end of the steel bar through which current flow is anticlockwise, that end becomes the North Pole and the end through which current flow is clockwise that end becomes the South Pole.