\textbf{60--} In the figure below, two charged particles are fixed on the x-axis. At a point on the x-axis, the net electric field from the two charged particles is zero. The distance of that point from charge $q_2$ is how many times $d$?
\textit{[Figure: Two charges $q_1$ and $q_2 = -4q_1$ are placed on the x-axis, separated by distance $2d$.]}
\begin{itemize}
\item[(1)] $d$
\item[(2)] $2d$
\item[(3)] $3d$
\item[(4)] $4d$
\end{itemize}
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