Variable Gap Magnet for Physics Demonstrations Base Size_8 x 5" exposing chamber interior and septal

exposing chamber interior and septal structure for entry-level cardiac teaching

paired with 4mm sockets so iron-filing patterns can be mapped around a current-carrying conductor for Oersted's experiment

and 125mm in a plastic wallet with keepers

this resistance box at plus-or-minus 1% on each step replaces dozens of fixed resistors at the bench

Sized for compact classroom display

Variable Gap Magnet for Physics Demonstrations Base Size_8 x 5" exposing chamber interior and septalAdjustment screws (3 x 1 inch) on a metal base position two neodymium magnets, varying the pole gap from 0. 4 to 8. 5cm and field strength from 100 to 7500 Gauss across the working volume.