\textbf{182-} In the circuit shown, $V_A - V_B$ is how many volts? (Internal resistances of the batteries are negligible.)
\medskip
\textit{[Figure: Circuit with two batteries $\varepsilon_1 = 10\,\text{V}$ and $\varepsilon_2 = 10\,\text{V}$, resistors $6\,\Omega$, $4\,\Omega$, $3\,\Omega$, between nodes A and B.]}
\medskip
(1) $4$ \hfill (2) $-4$ \hfill (3) $16$ \hfill (4) $-16$
\medskip