A girl is trying to make a simple electromagnet to help her pick up a piece of metal she dropped under a car. Which list of materials would she need to make an electromagnet? (1 point)
metal rod for a core, copper wire, 12-volt battery
wooden rod for a core, copper wire, 12-volt battery
◎ glass rod for a core, copper wire, 12-volt battery
◎ plastic rod for a core, copper wire, 12-volt battery