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random_user13

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## Homework Statement

this is problem 1.4 from purcells electricity and magnetism 2nd edition.

Two volleyballs, mass 0.3 kg each, tethered by nylon strings and charged by an electrostatic generator, hang as shown in the diagram. which cam be found here http://www.fysik.su.se/grulab//LabDataBas/2005/2005_9_27_14_21_10/R1_03.pdf

the height is 2.5 m and distance between the charges 0.5 m the diagram is a little messed up.

What is the charge on each in coulombs assuming the charges are equal? When trying to work this problem, I ended up just looking up the solution online here. i was getting close to the answer. I used the radius instead pf the distance between the two charges. Hence my question:

I don't understand why the distance between the two charges is used. Should the radius not be used?