A point charge of 6.0 nC is placed at the center of a hollow spherical conductor (inner radius = 1.0 cm, outer radius = 2.0 cm) which has a net charge of ?4.0 nC. Determine the resulting charge density on the inner surface of the conducting sphere.
A. +4.8 ?C/m2
B. ?4.8 ?C/m2
C. ?9.5 ?C/m2
D. +9.5 ?C/m2
E. ?8.0 ?C/m2
Answer: B
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