Which of the following will create a magnetic field? Choose all that apply
_An ion that is slowing down from 500 km/h to 400 km/h.
_A neutron that is speeding up from 1000 m/s to 1200 m/s.
_A neutrino moving at a constant velocity of 60 mph due north.
_ An electron that is stationary.
_A proton moving in a circle while traveling at a constant speed of 20 in/min.