I think you should limit it to one question per thread, so that the answers are also understandable and of help to others who may be perusing this forum. I also think the handwriting is too difficult to readily discern the question.
(23) I reckon the answer may lie in the fact that the spheres are conductive. Normally, this sort of question relates to the use of insulating spheres, where the situation is equivalent to a point charge located at the centre of each sphere. But in your question, the spheres are not insulating. How may this change things?