A charged particle with charge $ q $ moves with velocity $\vec{v}$ in a magnetic field $\vec{B}$. What is the magnetic force experienced by the particle if $\vec{v}$ is parallel to $\vec{B}$?
Correct: A
When the velocity and magnetic field vectors are parallel, the cross product $\vec{v} imes \vec{B}$ becomes zero, resulting in zero magnetic force ($ \vec{F} = q(\vec{v} imes \vec{B}) $).