If a = 60 cm, b = 80 cm, Q = ?6.0 nC, and q = 4.0 nC, what is the magnitude of the electric field at point P?
A. 35 N/C
B. 42 N/C
C. 52 N/C
D. 64 N/C
E. 104 N/C
Answer: A
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