Electromagnetic damping and conductivity of metals

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SUMMARY

The discussion focuses on the relationship between the conductivity of metals and the rate of change in gravitational potential energy when subjected to an electromagnetic field of 5.4mT. The metals analyzed include Steel, Nickel Silver, Zinc, Aluminium, and Copper, with Copper exhibiting the highest conductivity at 58 x 10^6 siemens/m and a corresponding energy dissipation rate of 8.46 x 10^-4 J/s. Participants suggest that the relationship between conductivity and energy dissipation is likely exponential, with power dissipation being proportional to the square of the magnetic permeability and electrical conductivity of the materials. The conversation highlights the distinction between material properties and object properties in the context of electromagnetic damping.

PREREQUISITES
  • Understanding of electromagnetic fields and their effects on conductive materials
  • Familiarity with the concept of eddy currents and their applications
  • Knowledge of material properties, specifically electrical conductivity
  • Basic principles of gravitational potential energy and its relation to induced currents
NEXT STEPS
  • Research the mathematical relationship between conductivity and energy dissipation in electromagnetic fields
  • Explore the concept of eddy currents in different materials and their practical implications
  • Investigate the role of magnetic permeability in electromagnetic damping
  • Examine experimental setups for measuring the effects of electromagnetic fields on various metals
USEFUL FOR

Physicists, materials scientists, electrical engineers, and anyone interested in the principles of electromagnetic damping and conductivity in metals.

maltesers
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The following data shows the conductivity of 5 metals and the rate of change in gravitational potential energy due to induced current when the metal is passed through a electromagnetic field of 5.4mT on the end of a pendulum. you know, the classic eddy current experiment.
I'm just wondering if anyone knew an equation linking the conductivity and rate of energy disipation? It looks like an exponential relationship to me. Anyone know exactly what it is? Would be really helpful! cheers

Material Rate of change in Gravitational conductivity
potential energy(10^-4J/s) (10^6 siemens/m)

Steel 3.53 1.5
Nickel silver 3.62 3.5
Zinc 3.71 17
Aluminium 4.47 35
Copper 8.46 58
 
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sorry that table didnt come out properly
 
conductivity is a MATERIAL property, while PE is an OBJECT property.
IF each material was made into an object of the same dimensions (l,w,h)
AND were moved through the magnet at the same speed,
THEN then power dissipated by macroscopic electromagnetic phenomena
should be proportional to (magnetic mu)^2 (electrical conductivity).

I'd guess your data includes a lot of microscopic EM phenomena (friction).
 

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