5A40.30  CONDUCTIVITY OF A BOARD


  • Version 1
  • A 2" x 2" balanced on a watchglass can be moved with a charged "rod".







        (set watchglass concave up)


  • Version 2
  • Balance a toothpick on a nickel, cover it with a glass and balance another nickel on top.  Then challenge students to knock the toothpick off using a force, without knocking over the nickels or touching anything.


        (use new nickels and flat toothpick on coarse, flat surface)

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