Chronology Current Month Current Thread Current Date
[Year List] [Month List (current year)] [Date Index] [Thread Index] [Thread Prev] [Thread Next] [Date Prev] [Date Next]

Re: [Phys-L] magnetic circuits ... was: change in inductance with iron core

On 2021/May/05, at 11:51, Carl Mungan via Phys-l <> wrote:

Okay, that’s helpful. So how about if instead of a bar, I use a square donut so field lines can loop around through it so they never have to pass through air?

This might be easier if I use iron wire, initially long pieces passing through the core, but now I bend the free ends to join them together.

Which reminds me in the v. distant past I read that transformers favored sheets while DC pulse favored iron wires. In transformers closed mag. circuit, but in spark coils (for Crookes and X-ray tubes, auto, and early radio transmitters) only a core [1] in a solenoid (two collinear, of course).

John, please comment.

bc still has Model T spark coils from Pep Boys Auto.

[1] One end which activated the interrupter.