All our bolts were three inches in length, this way we only had to worry about the material and diameter of the bolts. A larger diameter meant a larger volume, since the lengths were all the same. The eight bolts all had forty loops of copper wire wrapped around it. Before completing the circuit with the energy source, an AA (1.5-V) battery, we made sure to tighten the loops and tried to eliminate the excess spacing between each loop. To test the strength of the electromagnets, we tested to see how many stables they can pick up. The stronger the magnetic field, the more staples it will pick up. Zinc-Steel Bolts                      Galvanized-Steel Bolts Our results show that Zinc-Steel is a much stronger core than Galvanized Steel. Regardless of the diameter of the bolts, the Zinc-Steel core always picked up more staples than the Galvanized Metal core. The largest difference occurs in the larger bolts. The bigger the bolts, the less powerful the electromagnet, and picks up less staples than the smaller bolts. A combination of the Zinc-Steel core and a small diameter at 1/4’ allowed the electromagnet to be at its strongest: picking up eight staples. While a combination of a Galvanized Metal core and a large diameter at 1/2’ caused the electromagnet to only pick up three staples. Which demonstrates that it is less than half as strong as the strongest electromagnet. However, the Zinc-Steel core was not as quite as strong as an iron core. Iron is definitely the best material to use for the core of electromagnets, however, when one is limited to Zinc-Steel or Galvanized Metal, Zinc-Steel is the better choice.