An atomic nucleus has a charge of +40e. What is the magnitude of the electric field at a distance of from the center of the nucleus? (k = 1/4??0 = 8.99 × 109 N ? m2/C2,
e = 1.60 × 10-19 C)
A) 5.4 × 10-8 N/C
B) 5.6 × 10-8 N/C
C) 5.8 × 10-8 N/C
D) 6.0 × 10-8 N/C
E) 6.2 × 10-8 N/C
Answer: C
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