Two large vertical and parallel metal plates having a separation of $1 \ cm$ are connected to a $DC$ voltage source of potential difference $X$. A proton is released at rest midway between the two plates. It is found to move at $45^{\circ}$ to the vertical $JUST$ after release. Then $X$ is nearly

  • [IIT 2012]
  • A

    $1 \times 10^{-5} \ V$

  • B

    $1 \times 10^{-7} \ V$

  • C

    $1 \times 10^{-9} \ V$

  • D

    $1 \times 10^{-10} \ V$

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