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