Question: Two point charges are separated by 4 cm. The attractive force between them is 20 N. Show that when they are separated by 8 cm,

Two point charges are separated by 4 cm. The attractive force between them is 20 N. Show that when they are separated by 8 cm, the force between them is 5 N. (Why can you solve this problem without knowing the magnitudes of the charges?)

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