Two particles have charges $\backslash ($ Q $\backslash )$ and $\backslash (-$Q $\backslash )($equal magnitude and opposite sign$).$ For a net force of zero to be exerted on a third charge it must be placed:

midway between $\backslash ($ Q $\backslash )$ and $\backslash (-$Q $\backslash )$

on the perpendicular bisector of the line joining $\backslash ($ Q $\backslash )$ and $\backslash (-$Q $\backslash ),$ but not on that line itself

on the line joining $\backslash ($ Q $\backslash )$ and $\backslash (-$Q $\backslash ),$ to the side of $\backslash ($ Q $\backslash )$ opposite $\backslash (-$Q $\backslash )$

on the line joining $\backslash ($ Q $\backslash )$ and $\backslash (-$Q $\backslash ),$ to the side of $\backslash (-$Q $\backslash )$ opposite $\backslash ($ Q $\backslash )$

at none of these places $($there is no place$)$

Attempts: $0$ of $1$ used