In figure a system of four capacitors connected across a $10\, V$ battery is shown. Charge that will flow from switch $S$ when it is closed is
  • A$5\, \mu C$ from $b$ to $a$
  • B$20\, \mu C$ from $a$ to $b$
  • C
    zero
  • D$5\, \mu C$ from $a$ to $b$
JEE MAIN 2015, Diffcult
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