If you triple the speed of a particle entering a magnetic field, what happens to the radius of the helix that it makes? Explain the reasoning that can lead a student to choose each of the answers. You do not need to agree with that reasoning.
(a) It triples.
(b) It becomes one-third as big.
(c) It increases by 9 times.
(d) It will not change if the magnetic field does not change.
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