(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Three point charges lie in a straight line along the y-axis. A charge of q1 is -9 microcouloumbs at y = 6 m and a charge of q2 is -8 microcoulombs at y = -4m. The net electric force on the third point charge is zero. Where is this charge located.

2. Relevant equations

Fe = k (q1*q2/r^2)

3. The attempt at a solution

Fe = k (q1*q2/r^2)

= (9*10^9)((9*10^-6)(8*10^-6)/(10m)^2))

= 6.5*10^-3 N

Then i attempted to plug in this value for Fe to receive the r, and the location, but

i don't know which two charges i had to use.

Thanks,

SLM

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# Homework Help: Charges: Electirc forces

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