Caculate the Pull in LBS of Electromagnets

[burnit]

I need to caculate the Pull in LBS of Electromagnets, i am missing some information regarding this & maybe some brain cells also.

B (Flux Density)= Flux Lines/ Area

Pull in LBS= B x A / 72,000,000

Ok, how do i get B Flux Density in lines per sq/inch for the calculation.

I guess it has to do with core permeability--i am using Steel
Input voltage & Amps
Number of turns on the Coils

Some help would be greatly appreciated.

 

[burnit]

Forgot to ask, should the core of a DC Electromagnet be Laminated?

Thanks