> Actually
I was thinking closer to a solenoid, and the whole array with
> manual buttons that would need to be pressed, very hands on and see what
> happens.
The logical error there is that a torid is a closed field and hence cannot
operate a solinoid (open field). The magnetic path of a core is a closed
loop.
See I am learning something again and we haven't even built anything. ;)
Cheesy, but we could just use a parallel circuit for the indicator, not my
preference though.
What might a drop of ferrofluid do if placed on a core?