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The force of attraction between the plates of a charged capacitor, at constant charge, is

  • A.inversely proportional to the square of their separation
  • B.directly proportional to their separation
  • C.independent of their separation
  • D.inversely proportional to their separation

Answer: C

The force is the energy density times the area, and at constant charge the field between the plates does not change as they are moved, so neither does the force. At constant voltage instead the field rises as the plates close and the force grows as the inverse square of the separation.

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