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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

E

_{net}= E

_{1}+ E

_{2}

E=F/q

F=k q

_{1}q/r

^{2}

Let q = point charge in the above formulas

## The Attempt at a Solution

E

_{net}= E

_{1}+ E

_{2}= 0

E

_{1}= -E

_{2}

k q

_{1}/r

_{1}

^{2}= -k q

_{2}/r

_{2}

^{2}

q

_{1}/r

_{1}

^{2}= q

_{2}/r

_{2}

^{2}

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? Im stuck here.

All help appreciated,

Thanks!

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