In a region, the electric potential varies as \(V = 10 - 50x\), where \(V\) is in volts and \(x\) is in meters. The electric field in the region is
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Whenever the potential is given as a function of position, use
\[
E=-\frac{dV}{dx}.
\]
A positive value of \(E\) means the field is along \(+x\), whereas a negative value means it is along \(-x\).