A solid conducting sphere of radius 2.00 cm has a charge of 8.00 %C. A conducting spherical shell of inner radius 4.00 cm and outer radius 5.00 cm is concentric with the solid sphere and has a total charge of '4.00 %C. Find the electric field at
(a) r = 1.00 cm,
(b) r = 3.00 cm,
(c) r = 4.50 cm, and
(d) r = 7.00 cm from the center of this charge configuration.