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