What must the initial state of motion of a charged particle be if it will follow a helical path in a magnetic field?
a) It must be moving at an angle that is neither parallel to nor perpendicular to the magnetic field.
b) It must be moving parallel to the magnetic field.
c) It must be moving perpendicular to the magnetic field.
d) It must be moving in the direction opposite to the magnetic field.
e) It must be initially at rest when it is placed in the magnetic field.
Ans: a) It must be moving at an angle that is neither parallel to nor perpendicular to the magnetic field.
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