Small Simple Electromagnet...Help Please!! hi I'm trying to make a simple small electromagnet using a core from electric drill transformer (I think its called permalloy if I'm not mistaken) which i machined into 17mm long and 2mm diameter. How can i make it powerful enough to produce a force of more than 0.001N without overheating the circuit. I'm using a 0.125mm insulated copper wire, powered by a Manson EP-613 power supply (0-30V , 2.5A DC power supply) Can anybody point me to a right direction? Such as formula needed for the calculation of voltage and current needed and advice on the design itself would be appreciated.