Question 49
Work in groups of two or three.
You will need: cell; cell holder or adhesive tape; about 1 m of plastic-coated wire with about 1 cm of insulation removed at each end; leads for use in circuits; switch; large iron nail; paperclips.
1 Wrap the insulated wire around the iron nail to form a coil, as shown in the picture. Wrap the turns tightly around the nail and use as much of the length of the nail as you can.
Leave enough wire at each end to connect to the cell. Make sure only the plastic coating of the wire is in contact with the nail.
2 Connect the coil into a circuit as shown in the diagram.
3 Test your electromagnet to see if the end of the nail will pick up paperclips. Use the pointed end of the nail.
Only switch on your electromagnet for the shortest possible time, otherwise the cell will not last long.
You will need: cell; cell holder or adhesive tape; about 1 m of plastic-coated wire with about 1 cm of insulation removed at each end; leads for use in circuits; switch; large iron nail; paperclips.
1 Wrap the insulated wire around the iron nail to form a coil, as shown in the picture. Wrap the turns tightly around the nail and use as much of the length of the nail as you can.
Leave enough wire at each end to connect to the cell. Make sure only the plastic coating of the wire is in contact with the nail.
2 Connect the coil into a circuit as shown in the diagram.
3 Test your electromagnet to see if the end of the nail will pick up paperclips. Use the pointed end of the nail.
Only switch on your electromagnet for the shortest possible time, otherwise the cell will not last long.
