which is the best description of how to build an electromagnet
attach one end of a wire to a Battery and attach the other end of the wire to an iron or steel core
attract a wire to one end of a battery, wrap the wire around an iron or steel core, and attach the other end of the wire to the other end of the battery
Connect one end of a battery to an iron or steel core with a wire, then connect the other end of the battery to the core with another wire
wrap a wire around an iron or steel core at least 10 times