A charged belt, 50 cm wide, travels at 30 m/s between a source of charge (electrons) and a sphere. The belt carries charge into the sphere at a rate corresponding to 76 A. (a) Compute the surface charge density on the belt. (b) What is the number density (number per unit area) of the electrons on the belt?

Answer

(a) `5.1 xx 10^(-6) C//m^(2) (b) 3.2 xx 10^(13)//m^(2)`