Suppose the conducting spherical shell in the figure below carries a charge of 3.60 nC and that a charge of -1.60 nC is at the center of the sphere. If a = 1.80 m and b = 2.40 m, find the electric field at the following. X b a N/C -Select- (a) r=1.50 m magnitude direction (b) r=2.20 m magnitude N/C direction -Select- (c) r = 2.50 m magnitude N/C -Select- direction (d) What is the charge distribution on the sphere? inner surface outer surface nC nc