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The potential midway between charges of \( +4 \) nC and \( -4 \) nC placed 2 m apart is

  • A.zero
  • B.36 V
  • C.72 V
  • D.18 V

Answer: A

The two contributions are equal in magnitude and opposite in sign at the midpoint, so they cancel. The field there is not zero but twice that of either charge alone, which shows the two quantities behave quite differently.

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