A graph of the \( x \)-component of the electric field as a function of \( x \) in a region of s...

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A graph of the \( x \)-component of the electric field as a function of \( x \) in a region of space is shown in figure. The \( y \) - and \( z \)-components of the electric field are zero in this region. If the electric potential is \( 10 \mathrm{~V} \) at the origin, then the potential at \( x=2.0 \mathrm{~m} \) is
(1) \( 10 \mathrm{~V} \)
(2) \( 40 \mathrm{~V} \)
(3) \( -10 \mathrm{~V} \)
(4) \( 30 \mathrm{~V} \)
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