While technically not an electromagnet, it is possible to build ... This is often referred to as a shaded pole, and the same technique can help AC motors self-start as well as hold in relays ...

as is the case in some of the newer large electromagnets. The magnet is of the bell form. The working pole if; a cone of GO degrees, and this end of the coil is tapered sufficiently to give the ...

The lines are closest at the poles, which is where the field is ... Speakers and microphones also have magnets within them. An electromagnet is one that is generated when a current flows through ...