The more poles used, {TAIL ~ the greater the complexity} of {HEAD ~ the magnet} but the more uniform the magnetic field configuration 
The more poles used , { TAIL ~ the greater the complexity } of { HEAD ~ the magnet } but the more uniform the magnetic field configuration
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH