Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of ?80 pC/m2. What is the magnitude of the electric field at any point not on either surface?
A. 1.1 N/C
B. 5.6 N/C
C. 7.9 N/C
D. 3.8 N/C
E. 4.0 N/C
Answer: B
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