Ok can anyone tell me how the nature of a material determine if it can be made into a magnet? Can anyone illistrate any ne of these to me - the field around a straight conductor - the magnetic field direction of a soleniod -the action of a relay how was the telephone developed with an emphasis on how it depended on the principles of magnetism? who contributed to the developmeent of the phone? wat general scientific principles upon which the operation of the phone designed by the person above is based? a direct description of how ther person above used the principles related to magnetic fields in his or her disgn?