sentence2_structure: certain other metals<>can form<>a(n) electromagnet
sentence1: Electromagnet An electromagnet is a magnet made by wrapping a coil of wire around an iron or steel bar.
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?