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Suppose the initial speed of the proton in the figure is increased.
Part A:Does the radius of each half-circular path segment increase, decrease, or stay the same?
Part B:Choose the best explanation from among the following:
A:A greater speed means the proton will experience more force from the magnetic field, resulting in a decrease of the radius.
B:The radius of a circular orbit in a magnetic field is proportional to the speed of the proton; therefore, the radius of the half-circular path will increase.
C:The increase in speed offsets the increase in magnetic force, resulting in no change of the radius.

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