you mean iron.. well you use iron for lotsa things.. its a new invention i know why you dont understand it... humans just started using it in the "iron age"
Yes, steel is a ferromagnetic material.
No, copper is not a ferromagnetic material.
No, lead is not a ferromagnetic material.
Yes, a magnet can repel a ferromagnetic material if the poles of the magnet and the material are aligned in a way that causes repulsion.
Iron
ferromagnetic material
A ferromagnetic material has a high magnetic permeability and can retain a strong magnetic field once magnetized. It exhibits spontaneous magnetization and can be easily magnetized and demagnetized. Ferromagnetic materials include iron, nickel, and cobalt.
ferromagnetic.
unmagnetized material pressentation
Curie temperature
Iron
I think the best material is ferromagnetic material , because in case of ferromagnetic material maximum number of magnetic lines of force pass through it. We know generator works on Faraday's principal of electromagnets. If the maximum no. of lines of force pass through it then when it rotate it cut maximum lines and produce better e.m.f .