Thus, {HEAD ~ a voltage VA} , substantially equal to 2E, will be produced between {TAIL ~ lower end A} of lower winding L1 and upper end B of upper winding L2 
produced between
Thus , { HEAD ~ a voltage VA } , substantially equal to 2E , will be produced between { TAIL ~ lower end A } of lower winding L1 and upper end B of upper winding L2
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH