If $V$ is the electric potential at a given point,then the electric field $E_x$ in the $x$-direction at that point is:

  • A
    $\int_0^\infty V\,dx$
  • B
    $-\frac{dV}{dt}$
  • C
    $-\frac{dV}{dx}$
  • D
    $-V\frac{dV}{dx}$

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