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