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Homework Help: Electromagnetic Force

  1. Jan 7, 2008 #1
    1. I'm doing a lab involving electromagnetic force. In the lab I stroked two pieces of clear plastic that were lying on a table. When I held the two pieces of plastic up in the air near each other, they were attracted to one another.

    I don't understand why at all? Any ideas?!
    Did I give the plastic a charge when I rubbed it ?! If they're attracted doesn't that mean they have opposite charges ?! Help!
  2. jcsd
  3. Jan 7, 2008 #2


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    Staff Emeritus
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    The plastic will have built up a static charge yes. Since they were attracted the charges will be opposite.
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