Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2. What is the magnitude of the electric field at a point 4.0 cm from the center of the two surfaces?
A. 3.8 N/C
B. 4.1 N/C
C. 3.5 N/C
D. 3.2 N/C
E. 0.28 N/C
Answer: B
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