Answer
$V_3 = 50.0~V$
Work Step by Step
In part (a), we found that $q_3 = 750~\mu C$
We can find $V_3$:
$V_3 = \frac{q_3}{C_3}$
$V_3 = \frac{750~\mu C}{15.0~\mu F}$
$V_3 = 50.0~V$
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