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
Answer: C
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