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\centerline{\bf Equipotential Surfaces}
\bigskip\bigskip

Draw the equipotential surfaces for each of the following static charge
configurations:
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\begin{itemize}
\item
Four positive charges arranged in a square.
\vfill

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\item
Two positive charges and two negative charges arranged in a square, with like
charges diagonally opposite each other.
\vfill
\end{itemize}
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