Strength of an ElectroMagnet with variables number of coils, material of rod type, iron or plastic, size of rod large or small, number of batteries, battery strength full or low
           
        
           
           
           
           
           weelookang@gmail.com, Francisco Esquembre, Felix J. Garcia Clemente, Siti, Coco
weelookang@gmail.com, Francisco Esquembre, Felix J. Garcia Clemente, Siti, Coco