Let u represent the electrostatic potential between two concentric metal spheres of radii R¹ and R² (R¹ δ²u/δr² + 2/r du/dr = 0
Suppose R1 = 2 cm., R² = 4 cm., And V₁ = 110 volts, V₂ = 0 volts.
If the Euler method calculates a first shot with the initial slope u '(2) = -100 and a second shot with u' (2) = -200, with step size h = 0.25, what slope is the adequate to meet boundary conditions?