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Homework Statement
Two particles are fixed to an x axis: particle 1 of charge q1= 2.1 * 10^-8 and particle 2 of charge q2= -4.00q1 at x=70 cm. At what coordinate on the axis is the net electric field produced by the particles equal to zero?
Homework Equations
Enet = E1 + E2
E=F/q
F=k q1q/r2
Let q = point charge in the above formulas
The Attempt at a Solution
Enet = E1 + E2 = 0
E1 = -E2
k q1/r12 = -k q2/r22
q1/r12 = q2/r22
At this point I thought I should try to isolate for one of the r values and plug it into a second equation to solve for one of the r values. But there is no other equation I can use to set up a system of equations... or is there? I am stuck here.
All help appreciated,
Thanks!
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