
$I=\frac{3}{6+4}=\frac{3}{10}$
Potential difference on $6\,\Omega$ resistance
$V=6 \times \frac{3}{10}=1.8 \text { volt }$
Capacitor will have same potential so charge,
$q = CV =(4\,\mu F ) \cdot(1.8 \text { volt })=7.2\,\mu C$



Reason : The current flows towards the point of the higher potential, as it does in such a circuit from the negative to the positive terminal.
