Answer
The battery voltage is $3.0~V$
Work Step by Step
We can find the battery voltage:
$\Delta V = \frac{Q}{C}$
$\Delta V = \frac{30\times 10^{-6}~C}{10\times 10^{-6}~F}$
$\Delta V = 3.0~V$
The battery voltage is $3.0~V$.
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