A small conducting sphere of radius $a$ mounted on an insulated handle and a positive charge $q$ is inserted through a hole in the wall of a hollow conducting sphere of inner radius $b$ and outer radius $c$. The hollow sphere is supported on an insulating stand and is initially uncharged. The small sphere is placed at the centre of the hollow sphere. Neglect any effect of the hole. Which of the following statements will be true for this system?

A hollow conducting sphere of inner radius $R$ and outer radius $2R$ is given charge $Q$ as shown in the figure, then the

A charged particle having a positive charge $q$ approaches a grounded metallic spheres of radius $R$ with a constant small speed $v$ as shown in figure. In this situation,.

There is a fixed positive charge $Q$ at $O$, and $A$ and $B$ are points equidistant from $O$. A positive charge $+q$ is taken slowly by an external agent from $A$ to $B$ along the line $AC$ and then along the line $CB$.