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Two capacitors, $C_1$ and $C_2$, are connected in series with a 12.0-volt direct-current source. The capacitance of $C_1$ is $600 \mu F$. When a voltmeter is connected across $C_1$, the voltmeter reads 3.0 volts.
What is the capacitance of $C_2$?
$200 \mu F$
$300 \mu F$
$600 \mu F$
$900 \mu F$
$1,800 \mu F$