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mikehibbert

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**[SOLVED] Calculate Electric field from two point charges**

## Homework Statement

Two point charges with q1=2x10^-5 and q2=-4x1-^-3 are located in free space at (1,3,-1) and (-3,1,-2), respectively, in a cartesian coordinate system. Calculate the electric field

**E**at (3,1,-2)

## Homework Equations

**E**=(1/4piE0)(-qr1/r1^3+qr2/r2^3)

## The Attempt at a Solution

I understand the above equation but am unsure of how to implement it using cartesian coords?

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