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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.

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