Electric Field of Point-Charges: What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of -16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 180,000 N/C
B. 5100 N/C
C. 1.8 × 1014 N/C
D. -180,000 N/C
E. -5100 N/C
Answer: A
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