Conical Conductor for Electrostatics Subcategory_Brushes and triple-parallel plastic wheels at

and triple-parallel plastic wheels at 50mm diameter in low-friction ball-bearing steel frames

Demonstrates relative planetary motion on a 13-inch three-dimensional solar system model with a 5

An 18mm pole gap on this 37 x 13 x 10mm Alnico U-shape concentrates field strongly enough to bend filings into clear field lines

providing a quick swap-in reference for general-purpose AC-circuit and timing-experiment work

Conical Conductor for Electrostatics Subcategory_Brushes and triple-parallel plastic wheels atUsed to extend the curvature vs charge density study to larger geometries, this aluminum cone on an insulating rod holds induced charge for surface charge mapping with a proof plane.