🧲 Bar Magnet - 2D Dipole Field Map and Compass Grid

2D companion of the 3D magnet simulation: field lines and a compass-needle grid of a two-pole bar magnet in the Earth field, a draggable probe with |B| readout and a point-dipole accuracy check.

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install