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## Homework Statement

http://img219.imageshack.us/img219/3310/problemi.png [Broken]

## Homework Equations

F = kq/r^2

## The Attempt at a Solution

O ----- x ----O -----------O

Let the electric field of the first

*O*be E1, second be E2, third be E3.

RED - .02m

BLUE - .016m

GREEN - .033m

E1 = (9 * 10^9) (7.6 * 10^-6) / (.02^2) = 1.70763 * 10^8

E2 = (9 * 10^9) (1.6 * 10^-6) / (.016^2) = 5.61722 * 10^7

E3 = (9 * 10^9) (2.8 * 10^-6) / (.033 + .016)^2 = 1.04811 * 10^7

E1 and E3 are going

**->**and E2 is going

**<-**.

So I figured the magnitude of the electric field strength would be the absolute value of

*E1 + E3 - E2*which turned out to be

**N/C.**

*1.25072 * 10^8*However the answer is apparently wrong and I'm not sure where I made a mistake =\.

Any help is appreciated.

**Never mind I caught my mistake after re-reading what I typed out...turns out I used 7.6 for the first charge instead of 7.9 :(**

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