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1. The problem statement, all variables and given/known data

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 fieldEat (3,1,-2)

2. Relevant equations

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

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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# Calculate Electric field from two point charges

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