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