Question: An unknown particle moves in a straight line through crossed electric and magnetic fields with E = 1.5 k V/m and B = 0.034 T.

An unknown particle moves in a straight line through crossed electric and magnetic fields with E = 1.5 k V/m and B = 0.034 T. If the electric field is turned off, the particle moves in a circular path of radius r = 2.7 cm. What might the particle be?

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