Question

If you make an electromagnet using a battery circuit and a steel nail, how can you increase its magnetic strength?
A.replace the nail with a copper rod
B.wrap more coils of wire around the nail
C.use a longer nail
D.remove the plastic insulation from the wire coil

Answer 1

..... I think that would B. If you get a chance, look up Rail Gun by BAE systems. The idea is basically the same. Use coils of a certain magnetic type, force electricity through it and you create the ability to launch a object using magnetic force.

Answer 2

thx girly