If atmospheric electric field is approximately $150 \,volt / m$ and radius of the earth is $6400 \,km$, then the total charge on the earth's surface is .......... coulomb

  • A

    $6.8 \times 10^5$

  • B

    $6.8 \times 10^6$

  • C

    $6.8 \times 10^4$

  • D

    $6.8 \times 10^9$

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