(a) A small polystyrene bead with a charge of 60.0 nc is at the center of an insulating glass spherical shell with an inner radius of 20.0 cm and an outer radius of 40.0 cm. The glass material of the spherical shell is charged, with a uniform volume charge density of -2.30 PC/m². A proton moves in a circular orbit just outside the spherical shell. What is the speed of the proton (in m/s)? m/s (b) What If? Suppose the spherical shell carries a positive charge density instead. What is the maximum value the charge density (in pC/m3) the spherical shell can have below which a proton can orbit the spherical shell? C/m3 Need Help? Roadt