Dear EE'S I - sizing electromagnets

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Dear EE'S! I need help -- sizing electromagnets

Is it possibile to built different electromagnet's sizes, that can produce the same magnetic field and forces(e.g attraction/repulsion)?
If so how can I do that? By following this law: B = unl
By controlling the number of turns or the amount of current flowing in, I can do that?
 
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The reason, is that I'd like to expand the electromagnet's area without changing the magnetic field or the forces that I was able to get from my frist electromagnet X.
I want to build electromagnet Y that is larger and equally the same as X interms of the magnetic field and forces.

Since I'm only increasing the physical size of the electromagnet's area/w x h would that require more input?(I have a limited power source!).
 
I would recommend trying out your re-scaling using a simulator. Search for 'vizimag', it's free and relatively easy to use. It will also calculate magnetic forces, which is not a simple problem.
 
Ow I forgot to say!
That I'm just increasing the area of the core. So the electromagnet would be bigger.
I guess that the number of turns would decrease, the current would stay the same and its possibile to do?
 
Your question is not clear.
If you provide more information and maybe some sketches, someone may be able to help you.