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2019-05-22, 08:17:29
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Author Topic: Dose it take power to create a magnetic field  (Read 1380 times)

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It's not as complicated as it may seem...
Not with an air coil. It might change the inductance of a cored coil if the flux density moves part of the core above the BH knee.
During the slug attraction event, isn't the coil transitioning from an air core to a ferrite-cored coil?

Quote
I would expect an opposing emf as the keeper approaches and aiding emf when it departs.
Is this experiment not sufficiently representative of the "slug-sc coil" thought experiment? If there is an emf generated by the slug attraction event, why would it not cause a dissipation of power in the coil's finite resistance?


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Never let your belligerence get in the way of your brilliance!
   

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During the slug attraction event, isn't the coil transitioning from an air core to a ferrite-cored coil?
Indeed it is

Is this experiment not sufficiently representative of the "slug-sc coil" thought experiment? If there is an emf generated by the slug attraction event, why would it not cause a dissipation of power in the coil's finite resistance?
Because there is no time to dissipate the energy of the external flux disturbance in a coil in which the time constant is between 28 and 100000 years and resistance is so minuscule ...and in the case of "vortex glass" truly zero.
In a resistive coil, there is ample time.

BTW: I agree that the emf generated by the slug attraction event will diminish the current flowing through the coil.
   
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