181. The figure shows part of an electric circuit. In this circuit, which is in steady state, what is $V_A - V_C$ in volts? [Figure: Circuit with: from A, resistor $R_1 = 4\,\Omega$, then battery $\varepsilon_1 = 6\,\text{V}$ with internal resistance $r_1 = 1\,\Omega$, then resistor $R_2 = 3\,\Omega$, then a node with current $1\,\text{A}$ going right through $R_3 = 2\,\Omega$ to point C; capacitor $C = 6\,\mu\text{F}$ connected at the node; battery $\varepsilon_2 = 3\,\text{V}$ with internal resistance $r_2 = 2\,\Omega$ connected at point B below.]
[(1)] $6$
[(2)] $9$
[(3)] $12$
[(4)] $16$
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\textbf{181.} The figure shows part of an electric circuit. In this circuit, which is in steady state, what is $V_A - V_C$ in volts?
\textit{[Figure: Circuit with: from A, resistor $R_1 = 4\,\Omega$, then battery $\varepsilon_1 = 6\,\text{V}$ with internal resistance $r_1 = 1\,\Omega$, then resistor $R_2 = 3\,\Omega$, then a node with current $1\,\text{A}$ going right through $R_3 = 2\,\Omega$ to point C; capacitor $C = 6\,\mu\text{F}$ connected at the node; battery $\varepsilon_2 = 3\,\text{V}$ with internal resistance $r_2 = 2\,\Omega$ connected at point B below.]}
\begin{itemize}
\item[(1)] $6$
\item[(2)] $9$
\item[(3)] $12$
\item[(4)] $16$
\end{itemize}
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