Electromagnet which produces varying magnetic flux

[Sharlom]

I want to make an electromagnet but it should
Produce magnetic flux which changes with time.
What material wire would be the best to make make windings?

 

[Dale]

The usual choice is copper.

 

[Vanadium 50]

The way to make the flux change with time is to make the current at the power supply change with time. The magnet coil's material - usually copper - shouldn't enter into it.