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## Homework Statement

The picture below shows two stationary charges q1= +2mC and q2= -15 mC.

and I need to find the electric field vector at field point P(0,4m).

**E**= [px, py] .

Also

A little dipole is positions in P(0,4m) and is given with

**p**= [px,py]=[2*10^-8 ,0] Cm.

Find the torque that acts on the dipole because of the electric field and its potential energy

## Homework Equations

E=k*q/r^2

## The Attempt at a Solution

I have found out that E1=4.5*10[6][/SUP] and E2= 1.7*10^6. I am not sure if the electric field E1 is negative or positive ? I think its negative because the vector goes downwards. And when I find the angle for E2 do I use arctan(8/2)?