sentence2_structure: certain other metals<>can form<>a(n) electromagnet
sentence1: electromagnet A magnet made by wrapping a wire coil around an iron bar and sending an electric current through the coil.
sentence2: A solenoid or coil wrapped around iron or certain other metals can form a(n) electromagnet.
question: A solenoid or coil wrapped around iron or certain other metals can form what kind of magnet?