Here is the FBD of the small ball when moving (at constant speed u) through a viscous fluid before the magnetic field is turned on:
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The force that the viscous fluid exerts on the small ball, Ffl, may be found in terms of m and g:
Ffl=mg
The thermal energy dissipated in the fluid per second (the power of the fluid), Pfl, may be calculated in terms of m, g, and u:
Pfl=mgu
Here is the diagram of the moment when the uniform constant horizontal magnetic field, B,
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is turned on: (FM is the magnetic force exerted on the small ball):
Here is the FBD of the...
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