Question: Two charges, - Q and - 3Q, are a distance apart. These two charges are free to move but do not because there is

Two charges, - Q and - 3Q, are a distance ℓ apart. These two charges are free to move but do not because there is a third (fixed) charge nearby. What must be the magnitude of the third charge and its placement in order for the first two to be in equilibrium?

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