A magnetic field at the surface redirects ions and {HEAD ~ electrons} based on their velocity and {TAIL ~ charge} 
A magnetic field at the surface redirects ions and { HEAD ~ electrons } based on their velocity and { TAIL ~ charge }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL