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I know that vector precession equations such as mdV/dt=qBxV (Newton's Second Law written for the magnetic part of the Lorentz force) exist.

In the last equation magnetic field B=(B1,B2,B3) acts as an effective torque and the speed V=(V1,V2,V3) is the “pseudo-spin vector”.

These equations can be written also as:

mdV1/dt=-qB3V2+qB2V3

mdV2/dt=qB3V1-qB1V3

mdV3/dt=-qB2V1+qB1V2

I know three applications of these equations:

1) Optical Bloch equations written for two-level atom;

2) Stokes equation of polarization optics;

3) Gyroscope precession

Can someone give other physical applications of the vector precession equation

(dS/dz=ΩxS)?