Electrostatic P...

The equivalent capacitance between x and y is:

In the circuit shown in the figure, $$C1 = C, C_2 = 2C, C_3 = 3C, C_4 = 4C$$. Then, select the incorrect statement(s) from the following. 

Two identical capacitors $$1$$ and $$2$$ are connected in series to a battery as shown in figure. Capacitor $$2$$ contains a dielectric slab of dielectric constant $$k$$ as shown. $$Q_1$$ and $$Q_2$$ are the charges stored in the capacitors. Now the dielectric slab is removed and the corresponding charges are $$Q'_1$$ and $$Q'_2$$. 
Then

Find the equivalent capacitance across AB (all capacitances in $$\mu$$ F) :

Figure (i) shows a capacitors of capacitance $$C_1$$. A dielectric of dielectric constant K filling half the volume between the plates are inserted as shown in (ii) and (iii) having capacitances $$C_2$$ and $$C_3$$. Then,

Each side of a tetrahedral has a capacitor of capacitance $$C$$. Find the capacitance between point A and B.

A parallel-plate air capacitor of capacitance $$C_0$$ is connected to a cell of emf $$V$$ and then disconnected from it. A dielectric constant $$K$$, which can just fill the air gap of capacitor, is now inserted in it. Which of the following is incorrect?

All the capacitance in the figure are of capacitance $$C$$. The effective capacitance between $$P$$ and $$Q$$ is :

Two identical capacitors are connected as shown in given figure, having a charge $$q_0$$. A dielectric slab is introduced between the plates of the capacitor (I) so as to fill the gap, keeping the battery remain connected. The charge on each capacitors now will be :

For the configuration of media of permitivities $${ \varepsilon}_{o },\ \varepsilon $$ and $$\varepsilon_o$$ between parallel plates each of area $$A$$, as show in figure, the equivalent capacitance is :