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Sofia Matthews

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## Homework Statement

q1= 5 x 10^-6C position (1;2,-1)

q2= -3 x 10^-6 C position (-2,1,3)

a) what is the electric force caused by q2 on q1? (vector notation)

b) what is the electric field at (0,0,0)

## Homework Equations

F = kq1q2/r^2

E= F/q

## The Attempt at a Solution

I really don't know how to start this problem. Since this problem is in 3D, I don't know how to find the z coordinate of the electric force.

What I initially did was to find the electric force with Coulomb's law, but it gives me a number and not components. I tried to play with

**Pythagoras's theorem, but didn't figure anything out.**[/B]

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