- #1

Oaksmack

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q1=2.1*10^-8 C @ x=.2m

q2=-4.00q1 @ x=.7m

We are trying to find the coordinate on the x-axis where the net electric field produced by the particles = 0.

The equation I have is

E=((8.99*10^9)q)/r^2

I got what i thought was q2 first, by multiplying 2.1*10^-8 by -4.00 to get -8.4*10^-8. From there I equated E1 & E2:

((8.99*10^9)(2.1*10^-8))/r^2 = ((8.99*10^9)(-8.4*10^-8))/r^2

from there, I had no idea how to solve for r.

I simplified the constant 8.99*10^9 with the respective q's, but just couldn't figure out how to solve for r without it canceling into 1 and having two numbers equaling each other.

Please help, I have a number of problems like this to do for this chapter.