Faraday's Butterfly Net Electricity & Magnetism_Circuits the shared mass isolating volume

the shared mass isolating volume and density as the distinguishing variables across metals and polymers

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

and upper airway structures in a single anatomical plane

5-inch diameter artery cross sections reveals atherosclerosis

Reel of bare 18 SWG copper wire totaling roughly 80 feet by mass

Faraday's Butterfly Net Electricity & Magnetism_Circuits the shared mass isolating volumeDemonstrates 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.