The magnetic core 30 has a core length lm and {HEAD ~ the coil} 24 has a coil length lc less than {TAIL ~ the core length lm} 
The magnetic core 30 has a core length lm and { HEAD ~ the coil } 24 has a coil length lc less than { TAIL ~ the core length lm }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL