An electron enters between two horizontal plates separated by $2\,mm$ and having a potential difference of $1000\,V$. The force on electron is

  • A

    $8 \times {10^{ - 12}}\,\, N$

  • B

    $8 \times {10^{ - 14}}\,\, N$

  • C

    $8 \times {10^9}\,\, N$

  • D

    $8 \times {10^{14}}$ $N$

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