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The field of an electric dipole falls off with distance as

  • A.the inverse square
  • B.the inverse first power
  • C.the inverse fourth power
  • D.the inverse cube

Answer: D

The two opposite charges nearly cancel at a distance, and what survives is the difference of two inverse square terms, which falls as the inverse cube. The potential correspondingly falls as the inverse square rather than the inverse first power.

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