Magnet secrets

In daily life, the magnet is a very common thing. But thousands of years ago, the working people of our country according to the characteristics of magnet manufacturing was one of the four great inventions of the compass. Until today, the magnet is something very useful. From a variety of special electronic equipment to usual teaching toy, can often see figures of magnets. Below is a horseshoe-shaped magnet, suck in the bulk metal gadolinium (tone g รก). This is a and iron, cobalt and nickel as well as elements that are attracted to magnets, widely used to enhance magnetic resonance imaging.