From: jeroen@nospam.please   
      
   On 2021-08-27 08:07, Tom Del Rosso wrote:   
   > Jeroen Belleman wrote:   
   >> On 2021-08-26 04:25, Tom Del Rosso wrote:   
   >>> Jeroen Belleman wrote:   
   >>>> Tom Del Rosso wrote:   
   >>>>> AIUI you use iron cores for low frequency and ferrite for high   
   >>>>> frequency because ferrite doesn't get magnetized, so why couldn't   
   >>>>> aluminum do the same?   
   >>>>   
   >>>> You *want* a transformer core to be easily magnetized! You don't   
   >>>> want it to *stay* magnetized when the current goes to zero.   
   >>>   
   >>> Of course that's what I meant. It has to conduct a magnetic field   
   >>> but it must not fight the induced field when it reverses.   
   >>>   
   >>> I asked about the behavior of ferrite vs aluminum.   
   >>>   
   >>>   
   >>   
   >> The short answer is that aluminium is worse than nothing as a   
   >> transformer core. It *will* fight changing fields.   
   >   
   > That implies that it will "stay magnetized" as you put it, so the answer   
   > is too short but thanks for trying.   
   >   
   >   
      
   Aluminium is a good conductor. There will be eddy currents induced   
   in it that will oppose any /change/ of magnetic field. Lenz law and   
   all that.But once external fields are removed and enough time has   
   passed for eddy currents to decay, there will be no field left over.   
      
   Jeroen Belleman   
      
   --- SoupGate-Win32 v1.05   
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