What is the force between two small charged spheres having charges of 2 x 10-7C and 3 x 10-7C placed 30 cm apart in the air?
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q1 = 2 x 10-7 C, q2 = 3 x 10-7 C, r = 30 cm = 30 x 10-2 m F = 9 x 109 = 9 x 109 x \(\frac{2 \times 10^{-7} \times 3 \times 10^{-7}}{\left(30 \times 10^{-2}\right)^{2}}\) = 0.06 x 10-1 N = 6 x 10-3 N (repulsive)
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