The best quick example of bad physics is anything involving Superman. Unless he's so talented that he can engage his flight powers in direct response to the backwash from his super-hits, he should be flying backwards since it's the amount of friction underneath your feet that really dictates how...
I don't believe a field is created by the moving neutron due to a lack of any intrinsic properties to that end, but it would stand to reason that the influence of its motion would have some effect upon charge carrying particles and therefore possibly act in creating a weak electric field...
Since there is the above exposition, I'll just add in simpler language also that the added resistance of the iron core, if the solenoid is formed of uninsulated wire so there is contact, will add to the resistance of the system and therefore reduce current flow per "V=P/I."
This rarely has...
First off, it can reasonably be assumed that we're talking about an object subject to 1 normal Earth gravity (g)?
If so, this is relatively simple since it's only over a short distance span and you don't have to junk with changing gravity like with high altitude satellite launch problems...