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# Disc in a Magnetic Field Conductivity

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Given an aluminum disc of radius R, thickness d, conductivity , and mass density spins on its axis with initial velocity . It passes through poles of a magnet producing a magnetic field perpindicular to the disc over a small area A. With this initial speed how many revolutions will it make before coming to rest?

https://brainmass.com/physics/electricity-magnetism/disc-magnetic-field-conductivity-67420

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Given an aluminum disc of radius R, thickness d, conductivity , and mass density spins on its axis with initial velocity . It passes through poles of a magnet producing a magnetic field perpindicular to the ...

#### Solution Summary

The initial speed of how many revolutions will make before coming to rest are determined. Magnetic perpendicular fields are discussed.

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