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## Homework Statement

What is the electric force between a glass ball with 3.5 µC of charge and a rubber ball with -5.0 µC of charge when they are separated by 5 cm?

## Homework Equations

Colombs Law:

F(electric)=K((q(1)*q(2))/r^2)

K=8.99E9

## The Attempt at a Solution

This seems like a simple plug in problem but I'm having a little trouble.

First i get the elementary charges of both the glass and rubber balls

so 1.6E-19*3.5=5.6E-19 for q(1)

and 1.6E-19*5=8E-19 for q(2)

So i plug in the numbers i know and get:

F(electric)=8.99E9(((5.6E-19)*(8E-19))/(.005^2))=-1.611E-22

I plug this into the program my school uses for physics homework and it tells me im wrong.

Can you see where im doing something wrong? please any help is appreciated.