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Shows a capacitive circuit, with a switc...

Shows a capacitive circuit, with a switch `S_(W)`.
.
a. What is the potential difference between a and b when the switch is open?

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The correct Answer is:
a. `(200)/3V` b. `300 muC`
When switch is `S` open, for isolated system `1`,
.
`6(x-200)+3(x-0)=0`
or `x=(400)/3V`
Similarly for isolated system `2`
`3(y-2p00)+6(y-0)=0`
or `y=(200)/(3)V`
Thus `V_(a)-V_(b)=x-y=(400)/3-(200)/3=(200)/(3)V` .
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