Part A

Two point charges, $Q_1=3\mathrm{.}2C$ and $Q_2=-1\mathrm{.}6C,$ are placed on the $x$ axis. Suppose that $Q_2$ is placed at the origin, and $Q_1$ is placed at the coordinate $x_1=-6\mathrm{.}0cm($Figure $1).$

At what point$($s$)$ along the $x$ axis is the electric field zero? Determine the $x-$coordinate$($s$)$ of the point$($s$).$

Express your answer using two significant figures. If there is more than one answer, enter your answers in ascending order separated by commas.

$x_E=|$~$,cm|$

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Part B

At what point$($s$)$ along the $x$ axis is the potential zero? Determine the $x-$coordinate$($s$)$ of the point$($s$).$

Express your answer using two significant figures. If there is more than one answer, enter your answers in ascending order separated by commas.

$x_V=|,cm|$