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Home Q & A Board Science-Related Homework Help Physics
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nyonisikha nyonisikha
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11 years ago
I keep getting this question wrong, perhaps someone could show me how to do it?

Two small spheres of 15g each are suspended from a common point by threads of length 35cm. Each thread makes an angle with the vertical of 20 degrees. Each sphere carries the same charge. Find the magnitude of this charge.

Please help! Thanks.
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#1
11 years ago
From Conservation of energy and given"small spheres"
Ug = Ue
U = mgL(1-cos(20)) = kq^2/r
r = 2  L Sin(20)
q = Sqrt(m  g  L  (1 - Cos(20))  r / k)
q = 2.87297287074558E-07 C
q = 3E-07 C

If you need more help, let me know.
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