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