What you need:
A big nail, a thin plastic-coated copper wire, a D-size battery (the broad one), tape, paper clips, pins and other small magnetic items, wire cutter or blade.
What to do:
Leave about eight inches of the wire and start winding the rest around the nail. Make sure not to let the loops overlap.
Once the wrapping is done, leave another eight inches of wire before cutting it.
Shave off the plastic coating from the ends of the wire (about an inch on each side).
Tape each end of the wire to each end of the battery. The wire may get hot on touching the battery, so be careful.
What happens?
Once the wire’s connected to the battery, electricity starts flowing through the wire and the nail becomes a magnet! Put a few clips and pins close to it and see them get pulled to the nail.
Why?
Electricity creates magnetism. When electric current passes through the wire wound around the nail, it rearranges the molecules of the nail so that it begins to function like a magnet. Such a magnet is called an electromagnet.
Electromagnetism is temporary. Once you disconnect the battery, the nail will go back to normal.
Picture Credit : Google
