Two electromagnets have coil windings with respective cores ending adjacent the teeth to provide {HEAD ~ magnetic fields} between {TAIL ~ the core ends} and the teeth 
between
Two electromagnets have coil windings with respective cores ending adjacent the teeth to provide { HEAD ~ magnetic fields } between { TAIL ~ the core ends } and the teeth
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH