A Spherical Conductor (Radius = 1

Multiple Choice

A spherical conductor (radius = 1.0 cm) with a charge of 2.0 pC is within a concentric hollow spherical conductor (inner radius = 3.0 cm, outer radius = 4.0 cm) which has a total charge of −3.0 pC. What is the magnitude of the electric field 2.0 cm from the center of these conductors?

A) 23 N/C
B) zero
C) 45 N/C
D) 90 N/C
E) 110 N/C