A point charge q = -0.36 nC is fixed at the origin, physics homework

Physics
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A point charge q = -0.36 nC

 is fixed at the origin.

r=________

Jan 16th, 2016

Thank you for the opportunity to help you with your question!

force due to the charged particle F = k(q1)(q2)/(r^2) and force due to gravity F = mg 

k = 1.38*10^-23 J/K , g = - 9.81 m/s^2

m = 1.67*10^-27 kg, q2 = 9.11*10^31 C

but F(charge) = F(g) thus k(q1)(q2)/(r^2) = mg 

convert nC to C q1 = -3.6*10^-10

r = sqrt(k(q1)(q2)/(m*g)) = sqrt ((1.38*10^-23)(-3.6*10^-10)(9.11*10^31)/(1.67*10^-27)(- 9.81)

r=5.256*10^12m

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jan 16th, 2016

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