what would happen to the force between two charged objects if the amount of charge on both objects doubled

First The size of the force varies inversely as the square of the distance between the two charges. Therefore, if the distance between the two charges is doubled, the attraction or repulsion becomes weaker, decreasing to one-fourth of the original value. ... The size of the force is proportional to the value of each charge.If the magnitude of one charge is doubled then the magnitude of the force is also doubled. The force is not proportional to the square of the charge, so the magnitude of the force will not change by a factor of four.

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Explanation:

heat the gas and measure the pressure

double the distance = divide strength by 4