A student is thus able to study magnetic fields, electromagnetic forces, and {HEAD ~ their interaction} through {TAIL ~ use} of this device 
through
A student is thus able to study magnetic fields , electromagnetic forces , and { HEAD ~ their interaction } through { TAIL ~ use } of this device
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 OTH OTH OTH