How to find the force of particles

[itsmarasilly]

Homework Statement

A positive and a negative charge, each of magnitude 1.9 multiplied by 10^-5 C, are separated by a distance of 11 cm. Find the force on each of the particles.

Homework Equations

F = kq^2/r^2
r = sqrt(kq1q2/F)

The Attempt at a Solution

i'm not sure which numbers are placed where in each equation :(

 

[Hootenanny]

Can you start by explaining what each of the symbols in the first equation mean?

 

[itsmarasilly]

r stands for culomb's law(?), and I'm not quite sure about the others..

 

[hopeless123]

r stands for radius which is the distance between the two charges.
k is the columbs constant = 9x10^9
q represents the charges. We actually ignore if its positive or negative at this point so we can say q^2
normally it would be (q1)(q2) / r^2





A positive and a negative charge, each of magnitude 1.9 multiplied by 10^-5 C, are separated by a distance of 11 cm. Find the force on each of the particles.

F = kq^2/r^2 = (9 x 10^9) [(1.9 x 10^-5)^2 / (.11 m)^2)]

that should be the force of attraction between the two
so the force on one of the charges should point in the direction of the other charge
the force on the other charge should point towards the first charge. They should
both be of equal value other than positive and negative.