Twо cоncentric sphericаl cоnducting shells hаve rаdii = 4.8 cm and = 12.7 cm as shown in the drawing. The shells have a finite thickness that is much less than either radius. The inner and outer shells carry net charges = 3.2 nC and = 1.0 nC respectively. What is the electric field strength at a distance 7.1 cm from the center of the sphere?