At least earphones and speakers use permanent magnets[1], though according to Wikipedia[2] the early ones actually used electromagnets. I agree though that rela

At least earphones and speakers use permanent magnets[1], though according to Wikipedia[2] the early ones actually used electromagnets. I agree though that relays and maglev use electromagnets. I'm not sure about the rest. [1]http://www.physics.org/article-questions.asp?id=54 http://www.physics.org/article-questions.asp?id=54 [2]https://en.wikipedia.org/wiki/Loudspeaker#History https://en.wikipedia.org/wiki/Loudspeaker#History