Numerical on vector Calculus part 2 (Stoke's Theorem)
https://youtu.be/ZWu752tGHrU  In this post the following problem is solved based on line integral and stoke's theorem.  If A = ρ cos ϕ âρ + sin ϕ âϕ, evaluate ∮ A • dl around the path shown in figure. Confirm this using Stokes's theorem. Solution-  See the detailed explanation of the problem https://youtu.be/ZWu752tGHrU