Mini here phones and signed in the way pictured below a coil of wire carrying an electric current is wrapped around a diamond speakercone the Cone and Coyle are placed near a small bag sound is generated by the speaker cone vibrating in different ways the Cone vibrate as different magnetic forces act on a current caring coil why do the magnetic force is acting on the coil change as a current running through the coil changes a because the current generates a magnetic field around the coil be because the coils of wire are not usually attracted to magnets see because of current causes a magnet to gain power