# Answer to Question #125 in Electromagnetism for Darakhshan

Question #125

How many times should the distance be changed between the charges with an increase of one of them in 4 times, so that the interaction force remained the same?

Expert's answer

The formula of power is F ∼ q1*q2/r².

It is clear from the formula that when the charge is increased in 4 times, the distance should be increased in 2 times.

It is clear from the formula that when the charge is increased in 4 times, the distance should be increased in 2 times.

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