Another Question about electromagnets?

Question

To make an electric magnet I have a wire a battery and a piece of iron - the only problem is the piece of iron has a small hole right through the middle of it and im wondering if it will still become magnetic?

Answer 1

Yes. the hole won't matter.

Actually you can make an electromagnet without the metal core just by wrapping the wire in a coil. But it is more concentrated (stronger) with the metal core.

Answer 2

Yes it will. It is the invisible magnetic flux produced around the wire that produces the magnetism. The iron core is just amplifying it all.