Procedures: (Note: Make sure that the iron nail does not have any rust Be careful ning material
1. Make an electromagnet by winding the electrical wire around the large nail. 2 connect both ends of the wire to a dry cell.
3. Test the electromagnet by placing some pins and thumbtaces near the sales thetha thumbtacks?
4 Loosen the cost of wire in the electromagnet and find out how many metals are attrade to the wind more coils of wire. Which set up attract more metals?
5 Add more dry cells to the electromagnet. Make sure you connect the dry cells property, which more metals?
6.Change the nad into a smaller one. Which setup attracts more metals?


Questions: What is the effect of the following variables on the strength of an electromagnet?
1.tightness of the wire coiled around the nail.
2. number of coils of wire around the nail. 3. number of dry cells used.
4. size of nail.​