sentence2_structure: certain other metals<>can form<>a(n) electromagnet
sentence1: An electromagnet, in its simplest form, is a wire that has been coiled into one or more loops, known as a solenoid.
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?