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two charges, -Q and -3Q are a distance r apart. These two charges are free to move but do not because there is a third charge nearby. What must be the charge and placement of the third charge for the first 2 to be equilbrium?

The answer is:

The charge is 0.4Q

and the distance is 0.37l from -Q toward -3Q

Can someone explain to me?

The answer is:

The charge is 0.4Q

and the distance is 0.37l from -Q toward -3Q

Can someone explain to me?

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