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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.

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