Permeability of Iron: How Does It Affect Electromagnets?

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    Iron Permeability
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I know I change my mind often but hear me out on this. I'm changing back to iron core solenoids, but the frequency will be lower. So how high of a frequency can you have before it just reflects off the iron?

And yes, I do change my mind, but that is only in response to changing information. That's just science at work.