A +15-nC point charge is placed on the x axis at x = 1.5 m, and a ?20-nC charge is placed on the y axis at y = ?2.0m. What is the magnitude of the electric field at the origin?
A. 105 N/C
B. 15 N/C
C. 75 N/C
D. 45 N/C
E. 60 N/C
Answer: C
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