A parallel plate air capacitor has an initial capacitance $C$. If a plate separation is slowly increased from $d_1$ to $d_2$, then mark the correct statement(s). (Take potential of the capacitor to be constant, i.e., throughout the process it remains connected to battery.)

A dielectric slab fills the lower half of a parallel plate capacitor as shown in the figure. (Take plate area as $A$)

Figure shows a part of a circuit. If all the capacitors have a capacitance of $2 \mathrm{\mu F}$, then the charge on each capacitor is 

In the circuit diagram shown in figure,

Four capacitors and a battery are connected as shown in the figure. If the potential difference across the $7 \mathrm{\mu }\mathrm{F}$ capacitor is $6 \mathrm{V}$, then which of the following statement (s) is/are correct?

Find the potential difference between the points $A$ and $B$ and that between $E$ and $F$ of the circuit shown in the figure.