I know that most wire is copper, however, I found this wire that is silver in color. So that got me to thinking, what other metals are used in wire, and, are they all non-magnetic?
Are you stupid? All metals conduct electricity. Only ferrous (Iron containing) metals are magnetic.
It was made of tin and copper alloy. Outside coated with silver color tin to prevent rusty. This alloy is non magnetic. Other type wire or special cable were made with strand steel + copper like high voltage power line. Or like TV cable uses aluminum jacket shield copper coaxial cable.
It depends a little on how you define electrical wire but if you mean any wire that is used to conduct electricity even if it is not used specifically for wiring houses or electronics. So... No, some electrical wire, electrical resistance wire for example, is magnetic. Iron is not the only wire that is magnetic, Ni wire is made and it is magnetic, stainless steel wire is made and some stainless steels are magnetic.
Gold wire is sometimes used in the semiconductor industry. They could nickel and tin plate the copper in wires as either an identifier or corrosion inhibitor. All are non-ferrous although nickel has some magnetic properties. Aluminum was a failure in home wiring because of fire hazards, but is is used in some commercial appilications.
