Two point charges, q1 and q2, are located a distance equal to r apart in a vacuum. Which change to the charges will cut the magnitude of the electric force between them in half?  A) cutting the distance between them by one half   B) cutting the magnitude of each charge by one-half   C) doubling the distance between them   D) cutting the magnitude of one of the charges by one-half

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A: 2.  (A)