A$-2\mathrm{.}0$ nC charge and $a+2\mathrm{.}0nC$ charge are located on the $x-$axis at $x=-1\mathrm{.}0cm$ and $x=+1\mathrm{.}0cm,$ respectively.

Part A

At what position or positions on the $x-$axis is the electric field zero?

$0cm,+-$

$+-$

$+-1cm$

$0cm,+-1cm$

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Part B

At what position or positions on the $x-$axis is the electric potential zero?

$0cm,+-$

$+-$

$+-1cm$

$0cm+-1cm$