The xy plane is "painted" with a uniform surface charge density which is equal to 40 nC/m2. Consider a spherical surface with a 4.0-cm radius that has a point in the xy plane as its center. What is the electric flux through that part of the spherical surface for which z> 0?
A. 14 N ? m2/C
B. 11 N ? m2/C
C. 17 N ? m2/C
D. 20 N ? m2/C
E. 23 N ? m2/C
Answer: B
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