Easy electro charge question, calculation error?

[Paulkaryote]

Homework Statement

The sum of two point charges is + 11μC. When they are 2.9 cm apart, each experiences a force of 194 N. Find the charges given that the force is:
(a)Repulsive
(b)Attractive
(In microNewtons)

Homework Equations

F = KqQ/r^2
q + Q = Net charge

The Attempt at a Solution

I confirmed this with my friend and he got the same answer as me, so maybe we are both making the same mistake.

q + Q = 11 => q = 11 - Q
F = kq(11-Q)/r^2 => 194 = (9x10^9)(11-Q)Q/(0.029)^2
After solving and simplifying the quadratic I got Q = 11 and 1.6*10^-12 which is wrong.

 

[gneill]

Homework Statement

The sum of two point charges is + 11μC. When they are 2.9 cm apart, each experiences a force of 194 N. Find the charges given that the force is:
(a)Repulsive
(b)Attractive
(In microNewtons)

Homework Equations

F = KqQ/r^2
q + Q = Net charge

The Attempt at a Solution

I confirmed this with my friend and he got the same answer as me, so maybe we are both making the same mistake.

q + Q = 11 => q = 11 - Q
F = kq(11-Q)/r^2 => 194 = (9x10^9)(11-Q)Q/(0.029)^2
After solving and simplifying the quadratic I got Q = 11 and 1.6*10^-12 which is wrong.

Welcome to PF, Paulkaryote.

What happened to the units attached to the charge? They were not Coulombs, but microcoulombs.