Ramo: i=-q·v/d_gap; Q_induced=-q; Δψ_w=0; ψ_w(0)=0, ψ_w(d)=1

Sympy-exact symbolic witness of Ramo's theorem applied to the parallel-plate minimal-case geometry. Setup: q, v, x, d_gap sp-symbols positive. Weighting potential (linear between plates of separation d_gap with boundary ψ_w(0)=0,…