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So we state there is some kind of non zero flux over the sphere when the sphere is grounded. Does this mean we have an electric field inside the sphere? Can you please clarify this passage? Thanks again!

Thanks for the quick reply! So actually when the sphere is grounded it happens that all the opposite charges inside the sphere, with respect to the one which generates the field, goes away through the ground so the sphere will remain actually charged?

Hi colleagues, I need your help to figure out some subtle theory problmes I have about this topic. I was thinking about a system composed by a conductive sphere (not grounded) under the effect of a pont charge placed near the sphere. As I know we need two image charges to satisfy the boundary...