Mechanical angular momentum is not conserved in systems involving electromagnetic fields with
non-zero electromagnetic field angular momentum. Conservation is restored only if the total
(mechanical and field) angular momentum is considered. Previous studies have investigated this
effect, known as ‘Feynman’s Electromagnetic Paradox’ or simply ‘Disk Paradox’ in the context of
idealized systems (infinite or infinitesimal solenoids and charged cylinders etc). In the present
analysis we generalize previous studies by considering more realistic systems with finite components
and demonstrating explicitly the conservation of the total angular momentum. This is achieved by
expressing both the mechanical and the field angular momentum in terms of charges and magnetic field
fluxes through various system components. Using this general expression and the closure of magnetic
field lines, we demonstrate explicitly the conservation of total angular momentum in both idealized
and realistic syste…