two small plastic balls hang from threads of negligiblemass. Each ball has a mas

Question

two small plastic balls hang from threads of negligiblemass. Each ball has a mass of 0.39 g and a charge ofmagnitude q. The balls are attracted to each other, and thethreads attached to the balls make an angle of 20 degree with thevertical, (a) Find the magnitude of the electric force acting oneach ball. (b) find the tension in each of thethreads. (c) Find the magnitude of the charge on the balls. two small plastic balls hang from threads of negligiblemass. Each ball has a mass of 0.39 g and a charge ofmagnitude q. The balls are attracted to each other, and thethreads attached to the balls make an angle of 20 degree with thevertical, (a) Find the magnitude of the electric force acting oneach ball. (b) find the tension in each of thethreads. (c) Find the magnitude of the charge on the balls.

Explanation / Answer

(a)electric force F = k * (q * q/r^2) k = (1/4o) = 9 * 10^9 Nm^2/C^2 (b)the tension is T = mg * cos m = 0.39 g = 0.39 * 10^-3 kg g = 9.8 m/s^2 = 20o (c)the gravitational force between the charges is F1 = (G * m * m/r^2) or F = F1 or k * (q * q/r^2) = (G * m * m/r^2) or q = (G/k)^(1/2) * m G = 6.67 * 10^-11 Nm^2/kg^2 (c)the gravitational force between the charges is F1 = (G * m * m/r^2) or F = F1 or k * (q * q/r^2) = (G * m * m/r^2) or q = (G/k)^(1/2) * m G = 6.67 * 10^-11 Nm^2/kg^2

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