A conducting sphere of radius $R$, and carrying a charge $q$ is joined to a conducting sphere of radius $2R$, and carrying a charge $-2q$. The charge flowing between them will be

  • A

    $\frac{q}{3}$

  • B

    $\frac{{2q}}{3}$

  • C

    $q$

  • D

    $\frac{{4q}}{3}$

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