A uniformly charged spherical shell has inner and outer radii of 28.0 cm and 32.0 cm, respectively. A point charge of -45.0 nC is located at the center of the spherical shell. A proton orbits around this arrangement just outside the spherical shell with a speed of 8.07 x 105 m/s. What is the volume charge density of the spherical shell? (Include the sign of the value in your answer.) pc/m Additional Materials Reading Submit Answer