The graph between the surface charge density and radius of curvature for an isolated conductor at constant potential is

Find the equivalent capacitance between point $A$ and $B.$

Find the capacitance between $A$ and $B.$

In the circuit shown, the charges on the capacitors $A$ and $B$ are respectively

An arrangement of three large metallic parallel plates with respective charges marked in figure is shown. What is the charge appearing on the left face of plate $B ?$

A parallel plate capacitor of area $A$ and plate separation $d$ is filled with two dielectrics as shown. What is the capacitance of the arrangement?