If a = 60 cm, b = 80 cm, Q = ?6.0 nC, and q = 3.0 nC in the figure, what is the magnitude of the electric field at point P?
A. 71 N/C
B. 56 N/C
C. 60 N/C
D. 53 N/C
E. 67 N/C
Answer: D
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