(a) A charge of -270e is uniformly distributed along a circular arc of radius 3.85 cm, which subtends an angle of 45°. What is the linear charge density along the arc?
(b) A charge of -270e is uniformly distributed over one face of a circular disk of radius 2.10 cm. What is the surface charge density over that face?
(c) A charge of -270e is uniformly distributed over the surface of a sphere of radius 2.10 cm. What is the surface charge density over that surface?
(d) A charge of -270e is uniformly spread through the volume of a sphere of radius 2.10 cm. What is the volume charge density in that sphere?