E&M II Griffiths Chapter 8

(These quantities are all per unit volume, i.e. densities)

Charged cylinder radius a length l inside solenoid

In the solenoid. B goes to zero. An E-field is induced. Field momentum goes away, but total momentum has to be conserved.

The induced E-field acts produces a torque on the charged cylinders. On the outer cylinder The outer cylinder acquires mechanical angular momentum due to this torque

+ = Lem Angular momentum is conserved. Field momentum is fully converted to mechanical momentum.