A solid spherical conductor has a radius of 15 cm. The electric field 30 cm from the center of this sphere has a magnitude of 800 N/C. What is the surface charge density σ on the sphere?
A) 7.1 × 10-9 C/m2
B) 1.0 × 10-8 C/m2
C) 1.4 × 10-8 C/m2
D) 2.8 × 10-8 C/m2
E) 1.1 × 10-7 C/m2
Correct Answer:
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