Two free positive charges 4q and q are a...

Two free positive charges 4q and q are a distance I apart. What charge Q is needed to achieve equilibrium for the entire system and where should it be placed from charge q ?

`Q=4/9q` (negative) at `l/3`

`Q=4/9q` (positive) at `l/3`

`Q=q` (positive)at `l/3`

`Q=q` (negative)at `l/3`

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