Using Magnet
The most practical use of magnet is in a compass. Compasses can assist people hiking in the mountains, sailors navigating the sea or pilots flying in the air. In the 12th century compass was first invented. This invention helped Chinese sailors cross the oceans in ships. The magnetic current in the compass points a tiny iron needle to the north. But compasses do not actually point to the North Pole. They point to the Magnetic North, which is a few hundred kilometers away from the actual North Pole. Today, magnet are critical in many electronic devices.