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