Re: magnetic field removing metal.
While you are right about a static magnetic field, a rapidly changing magnetic field simply requires the metal to be a good conductor. A rapidly changing magnetic field will cause an [link|http://en.wikipedia.org/wiki/Eddy_current|eddy current] in the metal pieces. They can then be isolated in what are called [link|http://www.cogelme.com/eng/e-eddy-current-separators.htm|eddy current separators]
Alex
Nobody has a more sacred obligation to obey the law than those who make the law. -- Sophocles (496? - 406 BCE)