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Moving Iron question

As I understand it, the motion of a magnet relative to a fixed coil will induce a varying current in that coil. Similarly the motion of a coil relative to a fixed magnet will induce a varying current in the coil. How does a Moving Iron Cart like the Grado or Soundsmith induce a current when the moving element is neither a coil nor a magnet. Any help here?

Thanks in advance,

Marty
martykl

Showing 3 responses by martykl

martykl OP
3,578 posts
 
FP,

Thanks for the link, but the Grado explanation is that the moving iron element creates an increase in one flux gap and a decrease in another as it moves back and forth on the cantilever. I don't quite understand what that means or how it induces a current. If there were already a constant current, I think I understand how it could impede that as it moves, but I don't understand how it could induce current.

Marty
martykl OP
3,578 posts
 
Thanks Story, I didn't realize that iron meant iron oxide = magnet.

Marty
martykl OP
3,578 posts
 
Got it.

Thanks
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