Using suitable delta-functions, find expressions for the charge densities p(r) for the following objects; a uniformly charged spherical conductor of radius a with total charge q. your p should be expressed in spherical coordinates a uniformly charged disk in the xy-plane of radius a and charge q, expressed in cylindrical coordinates. a uniformly ring in the xy-plane of radius a and charge q. expressed in cylindrical coordinates. in all cases the appropriate thing to check is that = q. and that the charges are uniformly distributed. for example in cylindrical coordinates is uniform if a is constant, and for a ring should be constant if the line charge density is uniform.