The Physics of Dropping a Magnet Through a Copper Tube

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SUMMARY

The discussion centers on the phenomenon of a cylindrical magnet, magnetized through thickness, being dropped through a copper tube. When the magnet descends, it induces eddy currents in the copper, creating a magnetic field that opposes the motion of the magnet, resulting in a deceleration effect. This interaction causes the copper tube to experience an increase in weight when the magnet is dropped inside, due to the reaction force exerted by the induced currents.

PREREQUISITES
  • Understanding of electromagnetic induction principles
  • Familiarity with eddy currents and their effects
  • Knowledge of basic magnetism and magnetic fields
  • Concept of Newton's third law of motion
NEXT STEPS
  • Research the principles of electromagnetic induction in detail
  • Explore the effects of eddy currents in conductive materials
  • Study the interaction between magnets and conductive tubes
  • Investigate practical applications of this phenomenon in engineering
USEFUL FOR

Physicists, engineering students, educators, and anyone interested in the practical applications of magnetism and electromagnetic principles.

robhlee
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Hello,

say you have a cylindrical magnet magnetized through thickness (not radially) and you drop it through a copper tube. It will slow down. Is there an opposite force on the tube? If you were to hold the tube in your hand and drop the magnet inside, would the tube feel heavier?
 
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