A small sphere with mass 9.00 µg and charge 4.30 µC is
Chapter 21, Problem 84P(choose chapter or problem)
A small sphere with mass \(9.00 \mu \mathrm{g}\)and charge \(-4.30 \mu \mathrm{C}\) is moving in a circular orbit around a stationary sphere that has charge \(+7.50 \mu \mathrm{C}\) . If the speed of the small sphere is \(5.90 \times 10^{3} \mathrm{m} / \mathrm{s}\), what is the radius of its orbit? Treat the spheres as point charges and ignore gravity.
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