Bonnie is dusting the house and raises a cloud of dust particles as she wipes across a table. if two 3.5 x 10-14c pieces of dust exert an electrostatic force of 4.1 x 10-12n on each other, how far apart are the dust particles at that time?

The electrostatic force between the two dust particles is given by:

where
is the Coulomb constant
is the charge of the two particles
is the separation between the two particles

Since we know the magnitude of the force, we can re-arrange the previous formula to find the separation between the two particles: