A solid insulating sphere of radius "a" carries a net positive charge Q uniformly distributed throughout its volume. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and carries a net charge -3Q. Using Gauss' law, find the electric field in regions 1, 2, 3 and 4. rsb 1 3 -30 V = 4 xr 3 A = 4a6 P= Q == 4 xr 2. A uniformly charged rod of length L and total charge Q lies along the x axis as shown in Figure a) Find the components of the electric field at the point P on the y axis a distance d from the origin. b) What are the approximate values of the field components when d>> L? L R = [+d R = L+d Ey = kg sine 1. Three point charges (-q), (-3q) and (-4q) are placed as shown in the figure. a) Find the electric field vector E at the origin. b) Find the electric force F acting on a 2q point charge placed at the origin. b. F=QE = 49 2a 2a Y 2a -3q X r(-49) (-41-33) 4. A wire having a uniform linear charge density & is bent into the shape shown in Figure below. Find the electric potential at point O. 2R 2R