Three capacitors of $1\,\mu F$,$2\,\mu F$,and $4\,\mu F$ are connected in series to a $10\,V$ source. The charge on the plates of the middle capacitor is:

  • A
    $7\,\mu C$
  • B
    $\frac{40}{7}\,\mu C$
  • C
    $\frac{20}{7}\,\mu C$
  • D
    $\frac{1}{7}\,\mu C$

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