coiled travel are a mean of unwire & an northern is made of coiled wires, tin core, and sink of recycling ->  an electromagnet is made of wires, iron core, and a source of electricity  an electromagnet is made of wires, iron core, and a source of electricity & tin object can be used as an tin peripheral & a vapor is a sink of electrical matter / one & an insulated unwire is a mean of unwire -> insulated wire, iron rod, and battery can build an electromagnet