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Electric spark in microwave

  1. Dec 26, 2011 #1
    I put a hamburger(wrapped by foil) into microwave and pressed start. I noticed an electric spark near the foil's surface. How can we explain this incident?
    ps. sorry for my english
  2. jcsd
  3. Dec 26, 2011 #2
  4. Dec 26, 2011 #3
    thank you very much
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