I have positively charged hollow spherical shell at origin, with radius R. Then negatively charged dot charge at (2R, 0, 0), and I'm supposed to find electric field everywhere.
What seems unclear is the field "behind" the sphere, where from you can not draw straight line to negative point charge. As in the question it is not stated if the spherical shell is conductor material or not. Isn't it with conductor materials that, the electric field of the dot charge can not penetrate through sphere, and thus not contributing to net field everywhere, where it would have to go through the sphere?
And also if the material of spherical shell is conductor, doesn't the point charge change how the postitive charge is distributed at it's surface, which makes it more complicated to calculate the electric field?
It seems to me that it would be too complicated getting the electric field, if the shell would be conductor, and that it should just be assumed to be insulator, but I'd like to be sure.