Question

Feynman's disk paradox used as a gyroscope?

Answer 1

I have recently learned about Feynman's disk paradox, where angular momentum is stored in the properties of the electric field. One example would be a coil with current going through whose axis is shared with a disk carrying charges on its edges. As long as the current flows through the coil the disk is motionless, but as soon as it is turned off the disk starts spinning due to the change in the magnetic field exacting a force on the charges. The explanation that I have heard why this does not violate the conservation of angular momentum is that angular momentum is stored in the electric field. So far so good.

Answer 2

Yes Fewnmans disk paradox can be