Electric Field of Point-Charges: The electric field at a point 2.8 cm from a small object points toward the object with a strength of 180,000 N/C. What is the object's charge q? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A. -16 nC
B. +16 nC
C. -17 nC
D. +17 nC
Answer: A
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