Question: Two identical point charges are a fixed distance apart. By what factor would the magnitude of the electric force between them change if (a) One

Two identical point charges are a fixed distance apart. By what factor would the magnitude of the electric force between them change if
(a) One of their charges were doubled and the other were halved,
(b) Both their charges were halved, and
(c) One charge were halved and the other were left unchanged?

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