What are the formulas for calculate to make a electromagnet
The formula that is used to calculate an electromagnet is ((N x I)^2 x k x A) / (2 x g^2). That is; the number of turns in the solenoid multiplied by the current squared. Then divide the answer that you get by the distance in meters between the piece of metal and the magnet. Read more at eHow.com http://www.ehow.com/how_5969962_calculate-force-electromagnet.html#ixzz2Ng2xPeHD.