Electrostatic and gravitational force

[psysicsfeet]

Homework Statement

Point charge Q = 4.26 μC is fixed at the origin. Now, point charge q = 4.88 μC is carefully placed directly above it (along the y-axis), and it floats at (0,9.51 cm). Find the mass of q, in kg. Assume: g = 9.803 m/s^2.

Homework Equations

F=kq1q2/r^2
G=mg
probably

The Attempt at a Solution

I guess I need to figure out the relationship between electrostatic and gravitational force.
but will it be as simply as F=G?

 

[Bystander]

simply as F=G?

Try the calculation and see.