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The energy of a system of two like charges brought closer together

  • A.increases, work having been done against their repulsion
  • B.decreases, the field between them being reduced
  • C.stays the same, energy depending only on the charges
  • D.becomes negative once the separation is small enough

Answer: A

Pushing like charges together requires work, and that work is stored as field energy. Two opposite charges behave the other way: bringing them together releases energy and the stored energy is negative relative to infinite separation.

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