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The force between two charges of the same sign is

  • A.attractive and directed along the line joining them
  • B.repulsive but directed perpendicular to the line joining them
  • C.zero, like charges exerting no force upon one another
  • D.repulsive and directed along the line joining them

Answer: D

Coulomb's law gives a positive product for like charges and the vector form then points each charge away from the other. The force acts along the line of centres, which is what makes it a central force and conserves angular momentum about either charge.

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