Two charged, concentric, conducting spherical shells have radii a = 0.10 m and b = 0. The inner shell has a charge of -7.0 x 10 -7 C. The outer shell...

.Two charged, concentric, conducting spherical shells have radii a = 0.10 m and b = 0.22 m. The inner shell has a charge of -7.0 x 10-7 C. The outer shell has a charge of +7.0 x 10-7 C. Find the magnitude of the electric field at a radius r = 0.16 m.