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Feb 6, 2012 at 3:55 vote accept countunique
Feb 6, 2012 at 4:11
Feb 6, 2012 at 3:34 comment added Siyuan Ren @user19192: The boundary conditions are not derived, but specified. They are that the total charge of the sphere is fixed as zero, that there is a point charge at a specific location, and that infinity has a zero potential.
Feb 5, 2012 at 15:16 comment added countunique Ok, I see what you're saying, but we are justified in using the method of images because of the uniqueness of solutions to laplace's equation when boundary values are specified. In your post we are deriving the boundary condition from the method of images, which I'm not sure is legitimate.
Feb 5, 2012 at 14:42 history answered Siyuan Ren CC BY-SA 3.0