How can I find the electrostatic force on one of the balls in the Pith Ball Lab?

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To find the electrostatic force on one of the balls in the Pith Ball Lab, the formula Fe = k * q1 * q2 / r^2 is used, where k is the electrostatic constant. The distance r is given as 0.073 m, and the angle of separation is 20 degrees. To calculate the electrostatic force, it's essential to determine the tension in the string and the horizontal component of the forces acting on the ball. A force diagram can help visualize the forces involved and isolate the electrostatic force. Understanding that the electrostatic force depends on both charges is crucial for accurate calculations.
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Pith ball lab. HELP

In the lab there are 2 balls that are being separated by an electrostatic force.
Since both of the balls are receiving the same force it is only neccesary to find the force on one of the balls.

So here goes. The formula I am using is Fe=k q/r(squared)

I know k= 9.0 x 10^9
R= 7.3 cm or .073m
and the angle is 20* for one side
I believe I need to find tension in the string. And find the horizontal component so I can find Fe because those 2 are equivalant. I am just not sure how to do it. :rolleyes:

Thanks for the help!
 
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I know someone knows this.
 
Drawing a force diagram for one of the balls will be the most helpful thing in this situation. Also, note the electrostatic force depends on BOTH charges, so its kqq/r^2. What exactly are you trying to find? Isolate this force from the force diagram. Then from there you can solve for whatever unknown you have.
 
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