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Homework Statement
A -12 nC charge is located at the origin.
What is the electric field at the position (x2,y2)=(−5.0cm,−5.0cm)? Write electric field vector in component form.
Homework Equations
The Attempt at a Solution
Here, r^2 = (-0.05 - 0 )^2 meters squared. q=-12*10^-9 C.
For the unit vector, I chose \hat{i} and \hat{j} for the horizontal and vertical components of the vector. In the solutions manual, they choose a unit vector \frac {1} {\sqrt{2}}. I am not sure how they chose this as their unit vector.
I think they start with unit vectors of 5*\hat{i} and 5*\hat{j} then to convert to unit vectors they divide by the magnitude of each of the vectors (which is the length of the hypotenuse; 5*\sqrt(2).
Can someone verify this, please?