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Force exerted by two charges 
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#1
Feb110, 06:59 PM

P: 35

1. The problem statement, all variables and given/known data
Two point charges are placed on the xaxis as follows: one positive charge, q_{1}, is located to the right of the origin at x= x_{1}, and a second positive charge, q_{2}, is located to the left of the origin at x= x_{2}. What is the total force (magnitude and direction) exerted by these two charges on a negative point charge, q_{3}, that is placed at the origin? Use [tex]\epsilon_{0}[/tex] for the permittivity of free space. Take positive forces to be along the positive xaxis. Do not use unit vectors. 2. Relevant equations Coulomb's Law: F = [tex]\frac{1}{4\pi\epsilon_{0}}\frac{\leftq_{1}q_{2}\right}{r^{2}}[/tex] 3. The attempt at a solution MasteringPhysics keeps giving me a "Check your signs error". Yet, as far as I can tell, I should be subtracting the force which is going left / the negative direction (ie, q_{2}) from the force going to the right (ie, q_{1}). Any hints? 


#2
Feb110, 10:28 PM

P: 35

My apologizes if the "attempt at a solution" section appeared blank for anyone  I have changed the link so that users who are not logged in can now see the link.



#3
Feb210, 07:53 AM

P: 286

u can find the electric field at the origin from the charge q1 and q2 and then u can find the force using F= q3 * E .. try this one, I hope it will work



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