Two small diameter 10gm dielectric balls can slide freely on a vertical channel. Each carry a negative charge of 1μC. Find the separation between the balls if the lower ball is restrained from moving.(a) 0.5(b) 0.4(c) 0.3(d) 0.2I have been asked this question in unit test.My question comes from Coulomb Law in division Electrostatic Fields of Electromagnetic Theory

Two small diameter 10gm dielectric balls can slide freely on a vertica

1.	Two small diameter 10gm dielectric balls can slide freely on a vertical channel. Each carry a negative charge of 1μC. Find the separation between the balls if the lower ball is restrained from moving.(a) 0.5(b) 0.4(c) 0.3(d) 0.2I have been asked this question in unit test.My question comes from Coulomb Law in division Electrostatic Fields of Electromagnetic Theory
Answer» Correct answer is (c) 0.3 Best EXPLANATION: F = mg = 10 X 10^-3 X 9.81 = 9.81 X 10^-2 N. On calculating R by SUBSTITUTING charges, we get r = 0.3m.

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