Electromagnets: Current, Coils & Polarity

Make the invisible field explainable. Change one variable at a time, identify the poles with the right-hand rule, and verify the external field with a compass probe.

• Solver-linked field lines and N/S polarity
• Visible conventional-current direction around the winding
• Distance-aware compass probe and deflection reading
• Center field, probe field, ampere-turns, and turn density
• Air core, linear iron core, more-turns, and reverse presets
• Six editable explanation steps for a 15-minute lesson
• 16:9 and 9:16 canvases with zoom and fullscreen