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A body gains 5 × 10^10 electrons. What charge does it carry?

A+8 × 10^-9 C
B-8 × 10^-9 C
C-3.2 × 10^-9 C
D+3.2 × 10^-9 C
Answer & Solution
Correct answer: B. -8 × 10^-9 C
Q = ne = 5 × 10^10 × 1.6 × 10^-19 = 8 × 10^-9 C, and it is negative because electrons were gained.
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