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Potential is a scalar quantity, with the consequence that the potential of several charges is found by

  • A.adding the individual potentials as vectors
  • B.taking the largest of the individual potentials
  • C.adding the magnitudes and then choosing a direction
  • D.adding the individual potentials arithmetically

Answer: D

Signs must be respected but no directions are involved, which makes the potential far easier to compute than the field for an assembly of charges. The field can then be recovered as the negative gradient of that potential.

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