Two small identical conducting balls start with different amounts of charge on t

Question

Two small identical conducting balls start with different amounts of charge on them. Initially, when they are separated by 55.0 cm (this is the center-to-center distance), one ball exerts an attractive force of 1.60 N on the second ball. The balls are then touched together briefly (charge is conserved in this process), and then again separated by 55.0 cm. Now, both balls have a positive charge, and the force that one ball exerts on the other is a repulsive force of 1.30 N. For this problem, use k = 9.0 × 109 N m2 / C2, and assume that the radius of each ball is small compared to 55.0 cm.

Before they were touched together, one ball had a positive charge. How much charge did that ball have?
_____________C

Explanation / Answer

the angle doesn't even matter... use this formula q^2 = [2p(8.85e-12)(m)(g)(x^3)]/L then take the square root of this answer m = mass in kg g = gravity or 9.8 x = given distance between balls (convert to meters) L = given length (convert to meteres) make sure to take the square root.

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