Question

If the velocity $\overrightarrow{v}$ has a component parallel to the magnetic field $\overrightarrow{B}$, trace the path described by the particle. Justify your answer.

Answer 1

If the velocity $\overrightarrow{v}$ of the charged particle has a component parallel to the magnetic field $\overrightarrow{B}$, instead of a circle, the resulting trajectory will be a helical path, as shown in figure. Because the velocity of the particle has a non-zero component along the direction of magnetic field $\overrightarrow{B}$