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