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

Two point charges lie on the x axis. A charge of -2.5 µC is at the origin, and a charge of +8.5 µC is at x = 10.0 cm.

What is the net electrical field at points x = +4 and at x = -4?

2. Relevant equations

E = kq/r^2

3. The attempt at a solution

For x = +4...

E= 9x10^9(8.5x10^-6)/.06^2 = 21250000

E= 9x10^9(-2.5x10^-6)/.04^2 = -14062500

Net E = 7187500 (which is wrong)

How do I solve this? Thanks.

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# Homework Help: Two Point Charges Net Electric Field

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