\textbf{61.} By decreasing the electric charge of a capacitor, if we reduce its energy by $\dfrac{3}{4}$, the initial potential of it becomes what fraction of its initial potential?
\begin{itemize}
\item[(1)] $\dfrac{1}{4}$
\item[(2)] $\dfrac{3}{4}$
\item[(3)] $\dfrac{7}{16}$
\item[(4)] $\dfrac{9}{16}$
\end{itemize}
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