Induced Magnetic Field: Moving Arbitrary Conductors in Nonuniform Fields

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SUMMARY

The discussion centers on the induced electric field in a conductor moving through a nonuniform magnetic field, represented mathematically as EMF = ∫C (v × B) · dl. The participants clarify that the induced field in the conductor is an electric field, not a magnetic field, and emphasize that the susceptibility of the conductor does not play a role in this context. The focus is on understanding the relationship between the motion of the conductor and the resulting electromotive force (EMF) generated by the varying magnetic field.

PREREQUISITES
  • Understanding of electromagnetic theory, specifically Faraday's law of induction.
  • Familiarity with vector calculus, particularly line integrals.
  • Knowledge of the concepts of electric fields and magnetic fields.
  • Basic understanding of the Lorentz force law and its application in electromagnetism.
NEXT STEPS
  • Study Faraday's law of electromagnetic induction in detail.
  • Learn about the Lorentz force and its implications for moving charges in magnetic fields.
  • Explore the mathematical formulation of electric fields generated by moving conductors.
  • Investigate the effects of nonuniform magnetic fields on induced electromotive forces.
USEFUL FOR

This discussion is beneficial for physicists, electrical engineers, and students studying electromagnetism, particularly those interested in the dynamics of conductors in varying magnetic fields.

vibe3
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If I have some arbitrary conductor moving through a (nonuniform) magnetic field \mathbf{B}(\mathbf{r}), would the induced field in the frame of the conductor be something like:
<br /> \mathbf{B}_{IND}(\mathbf{r}) = T \mathbf{B}(\mathbf{r})<br />
where T is some diagonal matrix whose entries are related to the susceptibilities of the conductor?

I'm having trouble finding any reference on this other than a wire moving through a uniform field with some velocity.
 
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vibe3 said:
If I have some arbitrary conductor moving through a (nonuniform) magnetic field B(r)B(r)\mathbf{B}(\mathbf{r}), would the induced field in the frame of the conductor be something like:
BIND(r)=TB(r)BIND(r)=TB(r)​

The induced field in the conductor is an electric field not a magnetic field. Susceptibility of the conductor is irrelevant.

The voltage or EMF = ∫C E⋅dl where E is the electric field in the conductor and dl is an elemental conductor length.
For a varying magnetic field B(x,y,z) and a conductor C moving with velocity v the
EMF = ∫C (vxB)⋅dl where the integral is taken around the conducting loop C.
 

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