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Magnet and eletricty

  1. Dec 28, 2009 #1
    1. how do they cool the (huge) magnets at CERN to -270 celsius degrees?
    2. how a power planet can increse or decresse the electric potential difference (voltage)?
    tthanksl
     
  2. jcsd
  3. Dec 28, 2009 #2
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