Question

how can you bulid a electromagnet?

Answer 1

a copper coil and an iron rod or nail make the copper coil round with higher frequency in the iron rod or nail and pas a battery current through it you can also add switch off you want.
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Answer 2

Hey.....!!!
Here take a pair of wire to remove the few distance of insulation from each end of the wire, nearly wrap the wire around the nail. The more wire u wrap around the nail, the electromagnet will be.
I hope it may help you.......!!!
Thank You......☺️☺️☺️