Solve Electrostatic Forces Homework: Tension & Charge

[drmjj55]

Homework Statement

Two 0.115-gram pith balls are suspended from the same point by threads 22.0 centimeters long. When the balls are given equal charges, the two strings form an angle between them, and the balls come to rest 15.0 centimeters apart. Neglect the mass of the thread.

What is the tension in each thread?
What is the magnitude of the charge on each ball?

Homework Equations

F_e=(kq1q2)/d²

The Attempt at a Solution

I drew a free body diagram, having the weight straight down, the tension at some angle, and the electrostatic force at some other angle. From this w=T+F_e The only problem is that I am having trouble finding q1 and q2.

 

[Simon Bridge]

Welcome to PF;

I drew a free body diagram, having the weight straight down, the tension at some angle, and the electrostatic force at some other angle.

What other angle?

From this w=T+F_e The only problem is that I am having trouble finding q1 and q2.

Check the problem statement:

Two 0.115-gram pith balls are suspended from the same point by threads 22.0 centimeters long. When the balls are given equal charges, the two strings form an angle between them, and the balls come to rest 15.0 centimeters apart. Neglect the mass of the thread.