Cartesian coordinate systems, the y-coordinate (y1) for the doublet refers to the vertical position of the doublet source (or sink) along the y-axis. The y-axis is one of the two perpendicular axes in a Cartesian coordinate system, typically representing the vertical direction.
- Cartesian coordinate for y axis for doublet one (y1)
- r1 is the radial distance for doublet one
- θ1 is the polar angle for doublet one