वेग क्षमता (ϕ) के संदर्भ में x और y दिशाओं में वेग घटक हैं:
1
μ = – \( \frac{{\partial \phi }}{{\partial x}}\,,\,\nu = - \frac{{\partial \phi }}{{\partial y}}\)
2
μ = \(\frac{{\partial \phi }}{{\partial y}}\,,\,\nu = \frac{{\partial \phi }}{{\partial x}}\)
3
μ = \(\frac{{\partial \phi }}{{\partial x}}\,,\,\nu = \frac{{\partial \phi }}{{\partial y}}\)
4
μ = –\( \frac{{\partial \phi }}{{\partial y}}\,,\,\nu = \frac{{\partial \phi }}{{\partial y}}\)