Electric and magnetic forces and energies for a parallel-plate capacitor and a flattened, slip-joint solenoid

Timothy H. Boyer
2001 American Journal of Physics  
A current-carrying solenoid can be imagined as fitted with slip-joints and flattened into a shape comparable to a parallel-plate capacitor. In this shape it is easy to calculate forces, the work done, and energy changes that are analogous to those for a capacitor with constant charge or constant voltage.
doi:10.1119/1.1407255 fatcat:j5v2ldy4dvdwnciaddgwcirk4i