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The potential of a dipole on the plane bisecting the line joining its charges is

  • A.zero
  • B.at its maximum for that distance
  • C.equal to that of either charge acting alone
  • D.twice that of either charge acting alone

Answer: A

Every point of that plane is equidistant from the two equal and opposite charges, so their scalar contributions cancel exactly. The field there is not zero, however, being directed from the positive charge toward the negative one.

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