Also, FYI Jeff Findley, another case of the use of magnetic torque, EM
drive w/o the violation of conservation of momentum, from the Biblio:

http://www7.informatik.uni-wuerzburg.../publications/

See:
P. Bangert, A. Kramer, K. Schilling, "UWE-4: Attitude and Orbit Control
on a 1U CubeSat scale using magnetic torquers and an electric propulsion
system", Pico- and Nano-Satellite Workshop, Berlin, 2018


Dave