Question

An iron bar can be made magnetic when ________.
its magnetic domains line up
it rotates its poles to line up with another magnet
it spins its electrons in different directions

Answer 1

i want to say it is A or B

Answer 2

One way to magnetize an iron bar is to rub it with another magnet, which helps align the bar's domains.

Answer 3

so what you are saying is its magnetic domains line up

Answer 4

Yes.
note that an iron bar does not have any poles until it is magnetized.

Answer 5

ok