The electric potential $V$ is given as a function of distance $x$ (metre) by $V = (5{x^2} + 10x - 9)\,volt$. Value of electric field at $x = 1$ is......$V/m$

  • A

    $-20$

  • B

    $6$

  • C

    $11$

  • D

    $ - 23$

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