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: The definition can be derived from the equation by considering
<math>d\fracdfrac{1}{4 \pi \epsilon_0}</math> is a constant k.
<math>q_1q_2</math> is the product of the [[Electrical Charge|charges]].
<math>d\fracdfrac{1}{r^2}</math> is the the [[Inversely Proportional|inverse]] of the square of the [[distance]].
Therefore
<math>F\propto\frac{q_1q_2}{r^2}</math>