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A General question on Electromagnets

Raksh
Prodigy 110 points

Hello,

I have got a simple question on the basics of electromagnets. We know that,a current carrying conductor will always produce a magnetic field around it and if the conductor is wound on ferromagnetic core it has the property to magnetize the core. What will happen if the current carrying conductor is wound on a strong Permanent Magnet core?

Thank you.


Regards,

Raksh

  • 0
    TI__Mastermind 20985 points
    Hi Raksh, my understanding is that the external magnetic field produced will be a combination of the permanent magnet's, and the field from the coil. The permanent magnet has a coercivity property that describes how much of an opposing force would de-magnetize the magnet. This is where a B-H curve applies.

    Best regards,
    RE
  • 0 in reply to RE
    Prodigy 110 points
    Hi RE,

    Right! If the Permanent Magnet is very strong and the current through the coil is small, what could be the interaction?. Does the field from the magnet exert some kind of force on the electrons?
    Thank you.
    Regards,
    Raksh
  • 0 in reply to Raksh
    TI__Expert 8885 points

    Raksh,

    If PM is stronger than current carrying coil, the flux-density in near vicinity would be predominantly of PM.

    Yes the PM magnetic field would exert force on current carrying conductor as per Lorentz, force, which is given as ,

    where ℓ is a vector whose magnitude is the length of wire, and whose direction is along the wire, aligned with the direction of conventional current flow I.

    This mean force is proportional to cross-vector product  and it is maximum when conductor plane and magnetic field plane are 90 degree  to each other because sin 90 term of cross-vector product and zero if both lies in same plane.

    Best Regards

    Milan

  • 0 in reply to Milan Rajne
    Prodigy 110 points

    Hello Milan,

    Thank you for the detailed explanation. It did help me to understand the mechanism and clear my queries.

    Regards,

    Raksh