Copper wire and magnet
The third: When it runs out of energy Have you ever played with magnets? If you have, then you may know that they stick to certain metals (like steel). Magnets are able to do this because they have a magical force in them called magnetism. Magnetic attraction — the force between two opposite poles, and magnetic repulsion: when like forces cause similar charged ends to move away from each other. It is amazing to think about, that something we cannot even see can have such an impact on the things in our world.
Okay, but how do you build an electromagnet? You can make one by gathering some relatively common items: copper wire, a nail, the battery and possibly a small magnet. Start by wrapping the YUHENG insulated copper wire around and around the nail. But leave some wire sticking out of both ends. This is so that youll be able to connect the ends to your battery. Next, you will attach one end of the wire to the positive or live side of your battery and leave a little gap between each wrap.
