# Homework Help: 2 neutral objects produce a charge, how many electrons added?

1. Feb 24, 2016

### romakarol

1. The problem statement, all variables and given/known data
Two spherical objects are separated by a distance of 2.5 x 10-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As a result each object experiences an electrostatic force that has a magnitude of 5.75 x 10-3 N. How many electrons did it take to produce the charge on one of the objects.

2. Relevant equations

3. The attempt at a solution
The lecture notes imply columb's law is involved, distance is d obviously but electrostatic force isnt part of columb's law so do i need to ue another formula? The hard bit in these q's is jsut figuring out which formula to use, then you just slot in the values so does anyone know which rule(s) to apply here?

2. Feb 24, 2016

### TSny

Welcome to PF!

What does "F" stand for in Coulomb's law?