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A point charge of 4 μC sets up what field at 3 m from it in vacuum?
A1.2 × 104 N/C
B4 × 103 N/C
C1.2 × 103 N/C
D1.33 × 103 N/C
Answer & Solution
Correct answer: B. 4 × 103 N/C
E = kq/r2 = 9 × 109 × 4 × 10–6 / 9 = 4000 N/C.
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