How do magnetic ferrites block RF signals?

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Scarlet~Witch
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i briefly read that magnetic ferrites can block rf signals. if so, how. what range limit if any is there on the ferrrite.. or did i post this question in the wrong area if not the wrong forum? I'm really REALLY curious about this. if I've gotten this wrong. well, I'm sorry.
thanks for your time..
Scarlet
 

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