What is the electrostatic force between one object with a charge of +5.0 × 10−6 C, and a second object with a charge of +2.0 × 10−6 C? The objects are 1.2 meters apart.

Question

In a pith ball experiment, the two pith balls are at rest. The magnitude of the tension in each string is |T| = 0.55 N, and the angle between each string and a vertical line is θ = 27.33°. What are the values for the magnitudes of electrostatic force, Fq, and the gravitational force, Fg?

Answer 1

Fq=.55*sinTheta
Fg=.55*cosTheta

first q:
F=kqq/r^2=...

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefor.html