Charge q is 1 unit of distance away from the source charge s. charge p is four times further away. the force exerted between s and q is the force exerted between s and p.
one0fourth
four times
one0sixteenth
sixteen times

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell