Find charge due to two particles
Suppose that the magnitude of the charge on the yellow sphere is determined to be 2q and at (d2cos(theta), d2cos(theta). Calculate the charge q_red on the red sphere at (d1,0) with a positive blue sphere,q, at the origin and whose net force,F, is in the direction of y. The yellow sphere is negative and the red sphere is positive. ( See picture bellow)
Express your answer in terms of q, d1,d2, and theta. Well the Fx on blue due to the yellow sphere= k(2q)(q)/(d2cos(theta))^2 and the Fx on blue due to the red sphere =  k(q_red)(q)/(d1)^2 Now what? I am unsure as to what to do now. Any help would be appreciated. Thank you. Stephen http://www.physicsforums.com/attachm...9&d=1219858491 
Re: Find charge due to two particles
Would you set them equal to each other?

Re: Find charge due to two particles
I would? because of the fact that there is no net force along the x axis. Hence all x components of the force must cancel out to equal 0. Do you not get the right answer by doing that?

Re: Find charge due to two particles
I set them equal to each other and solved for q_red and got:
q_red= 2qd1^2/(d2^2)(cos(theta)^2) Did I set up the original equations correctly? And did I find q_red correctly in terms of q, d1,d2, and theta? Thank you. I really appreciate the help. Stephen 
Re: Find charge due to two particles
I have to turn this in soon so any help would be appreciated.
thank you. Stephen 
Re: Find charge due to two particles
I don't see anything wrong with it. Does anyone else see anything wrong with it?

Re: Find charge due to two particles
bump
Does everyone agree with novaex? Are my equations correct? 
Re: Find charge due to two particles
Not to be a bother but I have to turn this in tomorrow. So if you can please tell me whether or not I set the problem up correctly and got the correct formula for q_red: q_red= 2qd1^2/[(d2cos(theta))^2]?
Thanks I would really appreciate it. Stephen 
Re: Find charge due to two particles
Any opinions????

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