nice info sir.. pero.. pwede ka namang makagawa ng temporary magnetic field by looping the wires on your screw driver..
ganito..
kuha ka ng wire... yung mahaba.. tapos.. kuha ka battery ng sasakyan or any battery na malakas.. loop the wire sa screwdriver,, tapos yung ends ng mga wire.. attach mo sa poles ng battery.. at jan.. magkakaroon ka ng magnetic screwdriver.. madali lang to.. at you can make your screwdriver a magnetic one after this procedure..