Halliday, Resnick & Walker — Electric Fields: Problem 4

4 Density, density, density. (a) A charge \(-300e\) is uniformly distributed along a circular arc of radius \(4.00 \text{ cm}\), which subtends an angle of \(40^\circ\). What is the linear charge density along the arc? (b) A charge \(-300e\) is uniformly distributed over one face of a circular disk of radius \(2.00 \text{ cm}\). What is the surface charge density over that face? (c) A charge \(-300e\) is uniformly distributed over the surface of a sphere of radius \(4.00 \text{ cm}\). What is the surface charge density over that surface? (d) A charge \(-300e\) is uniformly spread through the volume of a sphere of radius \(2.00 \text{ cm}\). What is the volume charge density in that sphere?