Faraday's Butterfly Net Electricity & Magnetism_Circuits Wider 70 x 20 x

Wider 70 x 20 x 8mm cross-section on this Alnico bar pair gives a broader pole face than typical bar magnets

5mm copper wire on a clear acrylic base support side-by-side comparison of how loop count multiplies the on-axis magnetic field at fixed current

and pith for stem anatomy and plant tissue teaching

sized so that students can compare its uniform-curvature surface charge against sphere and cone partners in the conductor set

5-inch diameter artery cross sections reveals atherosclerosis

Faraday's Butterfly Net Electricity & Magnetism_Circuits Wider 70 x 20 xDemonstrates that charge resides only on the outer surface of a conductor by inverting the charged net inside out and showing the charge transferring to the new outside layer.