Each of the magnet and magnetic piece has an associated magnetic flux density; the magnetic flux density generated by the magnet is larger than {HEAD ~ the saturation flux density} around {TAIL ~ the magnetic piece} 
Each of the magnet and magnetic piece has an associated magnetic flux density ; the magnetic flux density generated by the magnet is larger than { HEAD ~ the saturation flux density } around { TAIL ~ the magnetic piece }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL