\textbf{182.} A capacitor with capacitance $5\,\mu\text{F}$ has charge $q$. If its electric charge of $3\,\text{mC}$ is separated from the negative plate and transferred to the positive plate, the stored energy increases by $4.5\,\text{J}$. How many millicoulombs is $q$?
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(1) $3$ \quad (2) $6$ \quad (3) $9$ \quad (4) $12$
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\textit{Calculation Space}
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