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You're in a room with 2 iron bars

  1. Mar 19, 2009 #1
    You're in a room with 2 iron bars. One is a magnet and the other is not.
    How do you tell which one is the magnet? You have nothing but the iron bars to test this.
    Last edited by a moderator: Mar 19, 2009
  2. jcsd
  3. Mar 19, 2009 #2


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    Balance one across the other, like a +. If the magnetic one is on top it will prefer to point in a specific direction.
  4. Mar 19, 2009 #3
    Form a T shape. The behavior of the magnet near the poles should be different from the behavior near the middle of the bar.
  5. Mar 20, 2009 #4
    very good , can anyone tell me y i am getting warned for posting this.
  6. Mar 20, 2009 #5

    Vanadium 50

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    You should PM the mod who warned you.
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