A negatively-charged particle is slowly moving as it enters a region that has a constant magnetic field. If the velocity of the particle is initially perpendicular to the magnetic field, what will be the subsequent motion of the particle?
a) It will follow a helical path around the magnetic field lines.
b) It will follow a circular path in the plane perpendicular to the magnetic field lines.
c) It will follow a straight line path in the same direction as it was initially traveling.
d) It will follow a circular path in a plane parallel to the magnetic field lines.
e) It is impossible to predict the path the particle will follow.
Ans: b) It will follow a circular path in the plane perpendicular to the magnetic field lines.
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