Magnetic levitated electric wire

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SUMMARY

The discussion focuses on creating an instrument to demonstrate the magnetic levitation of a wire carrying electric current, utilizing the equations F = ILBsin(a) and W = ALg. The user aims to achieve equilibrium by balancing the magnetic force and weight, specifically using AC current from standard 220 V outlets. The conversation highlights the need for a uniform magnetic field, suggesting the use of Helmholtz coils for this purpose, while also considering the effectiveness of Neodymium magnets versus magnetic fields generated by coils.

PREREQUISITES
  • Understanding of magnetic forces and electric currents
  • Familiarity with the equations of motion in electromagnetism
  • Knowledge of Helmholtz coils and their applications
  • Basic principles of AC current and its effects on magnetic fields
NEXT STEPS
  • Research the design and construction of Helmholtz coils for uniform magnetic fields
  • Explore the principles of magnetic levitation using AC current
  • Investigate the properties and applications of Neodymium magnets in electromagnetic experiments
  • Study the Earnshaw theorem and its implications for magnetic levitation systems
USEFUL FOR

Students, educators, and hobbyists interested in electromagnetism, physics demonstrations, and experimental setups for teaching magnetic levitation concepts.

AHashemi
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Hi
I'm thinking about making an instrument to show the force on a wire carrying electric current for students in lab. A normal wire which levitates from ground after it has current flowing in it.

We have the following equations

F = ILBsin(a)
W = ALg

'A' being the mass of unit length of the wire. We will make the magnetic field perpendicular to the current flow so a=Pi/2 and sin(a)=1 and I want the wire to be suspended above the ground so in equilibrium we must have:

F = W
ILB = ALg
IB = Ag

Since g and A are constant in this device what I will need to do is playing with magnetic field and electric current.
I'm not very familiar with the Earnshaw theorem but I know if I use an AC current this is doable. I can use normal power outlets (220 V in this case) but I don't know how to create the uniform magnetic field needed. Are natural magnets (Like Neodymium magnets) better or a magnetic field generated by another wire or coil?
Is there any easier way to do this?
What are notes to keep in mind in this experiment?
 
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