one difference between an electromagnet and a bar magnet?

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2007-10-29 13:48:35 · 2 answers · asked by Cedric R 1 in Science & Mathematics ➔ Physics

Free current vs. bound current, respectively.

2007-10-29 16:04:56 · answer #1 · answered by Dr. R 7 · 0⤊ 0⤋

wrong question

elctromagnet and a permanent magnet

one retains magnetism
the other needs current to flow in a coil to produce the field

2007-10-29 14:00:09 · answer #2 · answered by Anonymous · 0⤊ 0⤋