The force between two electric charges -2uC
and 5 uC, separated by a distance of 10 cm in
air will be :
(a) 9N
(c) 4N
(b) 5N
(d) 2 N
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Answer: 9N
Explanation:
F = kq1q2/r2
= 9×10^9× 2×10^-6×5×10^-6/10×10×10^-4
= 9×10^12×10^-12
= 9 N
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