a magnetics question

Sulaiman, Fri Feb 15 2019, 11:33PM

Where would most of the magnetic flux be in an air cored solenoid close wound using insulated iron wire,
or in a partially stretched slinky ? Link2
what would the field look like?

A quick google produced nothing but I'm sure I read something in the past,
I'm off to do more searching but I thought that this may be a nice mental puzzle hence this post.
If you already know ... what is the answer ?
Re: a magnetics question
2Spoons, Sat Feb 16 2019, 11:20PM

Download FEMM4.2. Its a freeware 2.5D mag/electro/current/thermal field solver. That will tell you all you need to know
Re: a magnetics question
radiotech, Thu Feb 21 2019, 09:43AM

I do not the answer but I feel if you googled
the term Helmholtz Coil it would be know.

I do know I have two Helmholtz coils here.
Re: a magnetics question
Sulaiman, Thu Feb 21 2019, 05:24PM

Generally speaking I can imagine field shapes;
bar magnets, short or long solenoids, transformer air-gaps etc
If the wire was copper then I'd just treat it as a solenoidal winding,
if the iron wire is laid along the air cored flux lines then I can imagine it,
or even as an iron helix inside OR outside of the winding,
but when the winding wire itself is iron ?
Re: a magnetics question
Proud Mary, Fri Feb 22 2019, 11:55AM

Something like this perhaps: Link2