What is electromagnet and its use?
Most of us noticsed that, a compass needle will only point North –South, if there are no other magnets near it. But, if there are magnets near compass, the needle will be attracted towards them and will point in a different direction or be deflected. And it was discovered that if a compass was held near a wire carrying an electric current, the needle was deflected. But if the current was switched off the needle swung back and pointed North-South again. This meant that the current was acting like a magnet. If some wire is wrapped around a magnet and a current passes through the wire, the magnet will become much stronger. This is known as an electromagnet. Use 1 . Used in Computer Hardware and Memory Storage Devices. In these devices, data are stored in electromagnetic format in bits and bytes form. Even the computer hard ware is having a magnetic tape which works on the electromagnetic principle. Not limiting to this, the olden day VCR’s are having huge rolls of magnetic tapes, which ha