Whittled down your question amount to two things :
I want to know the average magnetic flux density on the surface of the track. Can anyone help me with this?
This would normally be considered a homework-type question. At a minimum you would be expected to show your own effort to work out the theoretical model. Even then we generally only answer this category of questions if they have a conceptual issue.
If you make appropriate edits to show this your question will automatically be placed on the list of questions to be voted for reopening. If enough people vote to reopen it, then it will be reopened. Note that if you repost the question it would most likely be closed as a duplicate of the original.
There is (AFAIK) no other way for you to force the question to be reopened.
Any other tips or help with this topic is also appreciated.
This just is not a type of question we deal with. It is vague and there is no way to define a correct answer, something we generally want to be possible for questions on SE.
Regarding it being closed as "engineering", this could be argued to be a valid interpretation of your question. You are building something, you want help with some aspect of that - that is engineering.