The iron core is formed of {TAIL ~ particles} of {HEAD ~ iron} or an iron based magnetic material 
The iron core is formed of { TAIL ~ particles } of { HEAD ~ iron } or an iron based magnetic material
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH