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How do I capture the collapsing field of a coil so I can use it again?

If I energize a coil and then switch it off, I get a collapsing field, I would like to capture this field and use it to energize a seperate coil, is that possible, and how would I do it.

Thanks.

jeff-o7 years ago
I imagine you'd need a second coil placed within the field of the first, that is connected to an energy storage device (like a capacitor).  It would end up being very much like an air-core transformer.  But, I think your losses would be so great that you wouldn't get much power out of it.
joecarey (author)  jeff-o7 years ago
Thank you jeff-o
jeff-o joecarey7 years ago
sure thing!
That's precisely what a fly-back inverter does.