A+2.50 μC point charge is at the center of a thin spherical shell of radius 0.100 m that has a uniform surface charge density. The electric field 0.200 m from the point charge has magnitude 2.93×105 N/C and points away from the point charge. What is the charge density (μC/m2) on the shell? −4.97 −18.3 1.20 −7.83 19.9 −2.39 −9.52 29.4 −6.68 −38.2
![An insulating solid sphere of radius R has a non-uniform charge distribution with volume charge density ρv = ρ0r/R where ρ0 is a constant and r is the distance from the center of the sphere to the point of interest. What is the magnitude of the electric field inside the sphere (for r < R )? [NOTE: To compute the enclosed charge, consider differential spherical shell elements of radius s and thickness ds so that the differential volume dv = 4πs2 ds and the differential charge dq = ρvdv ] Er = ρ0 R2 ε0 r2 Er = ρ0 R24 ε0 r2 Er = ρ0 r22 ε0 R Er = ρ0 r24 ε0 R](https://www.doubtrix.com/uploads/editor/7829287856QxGCGnqDrx.jpeg)