(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Two very small 8.55-g spheres, 15.0 cm apart from centre to centre, are charged by adding equal numbers of electrons to each of them. Disregarding all other forces, how many electrons would you have to add to each sphere so that the two spheres will accelerate at 25.0g when released?

2. Relevant equations

F= abs( (kq1q2)/r^2)

3. The attempt at a solution

25(9.81)=245

(245)(0.15)^2 = (9.00x10^9)(x^2)

(5.51 / 9.00x10^9) = x^2

2.47x10^-5 C = x = charge of one sphere

(2.47x10^-5) / (1.6x10^-19) = 1.55x10^14 electrons in one sphere

The answer's wrong :(

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# Homework Help: Coulomb's Law and acceleration

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