Hi I have problem finding the solution for this problem:
Find the divergence of the vector function A=ˆρ ρ
transform this vector function into rectangular coordinates and find the
divergence using rectangular coordinates calculation.
I know that I need to find 2 since I have computed it in cylindar coordinates.
But I don't succeed to do it in rectangular coordinates.
I replace ρ by sqrt(x^2+y^2+z^2) (where in this case z=0)and
the unit vector ˆρ by ˆx*cos(phi)+ ˆy*sin(phi)
N.B: In bold this is the unit vector.