- #1

- 3

- 0

## Homework Statement

Two very small 8.05-g spheres, 11.0 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?

## Homework Equations

F=ma

F=k(q1q2/r^2)

q=ne

## The Attempt at a Solution

F=ma=F=k(q1q2/r^2)

F= (8.05g)(25)(9.8m/s)=1972.25

1972.25(.11m)^2=(8.987e9)Q^2

(23.86)/(8.987e9)=Q^2

Sqrt(2.66e-9)=Q

5.15e-5=Q

Q=ne

n=5.15e-5/1.6e-19

=3.22e14 electrons