The electric potential $V$ at any point $(x, y, z)$ (all in $metres$ ) in space is given by $V = 4x^2\, volt$. The electric field at the point $(1\, m, 0, 2\, m)$ in $volt/metre$ is

  • A

    $8$ along negative $x-$ axis

  • B

    $8$ along positive $x-$ axis

  • C

    $16$ along negative $x-$ axis

  • D

    $16$ along positive $x-$ axis

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