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A compass needle undergoes forced oscillations under the influence of a uniform magnetic field ... and a rotating magnetic field ... with angular velocity ... (black arrow). The compass needle has a moment of inertia ... , a friction constant ... , and a magnetic moment ℳ. This is a simple example of a system that shows chaotic motion. In a real experiment it is impossible to repeat a particular motion from initial conditions ... and ... because the system is chaotic.
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