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For that same square of four equal charges, the field at the centre is

  • A.directed along one of the diagonals of the square
  • B.zero
  • C.four times the contribution of a single charge
  • D.twice the contribution of a single charge

Answer: B

Each pair of diagonally opposite charges contributes equal and opposite vectors at the centre, so the whole cancels. The potential there is nevertheless four times a single contribution, because potentials add as scalars, and the contrast between the two results is the point of the arrangement.

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