016 10.0 points Calculate the surface charge density for a solid spherical conductor of radius 0.459 m if the potential is 0.918 m from the center of the sphere is 2.54 kV. The Coulomb constant is 8.98755 x 10" N . m3/C2. Answer in units of C/m . Answer in units of C/m. 017 10.0 points How many electrons should be removed from an initially uncharged spherical conductor of radius 0.27 m to produce a potential of 7.3 kV at the surface? The Coulomb constant is 8.98755 x 10" N . m3/C and the fundamental charge is 1.602 x 10- C. Answer in units of electrons. Answer in units of electrons. 018 10.0 points If a conducting sphere is to be charged to a potential of 12400 V, what is the smallest pos- sible radius of the sphere so that the electric field will not exceed the dielectric strength 3 x 10" V/m of the air? Answer in units of mm. Answer in units of min