A charged particle is fired at an angle θ to a uniform magnetic field directed along the x-axis. During its motion along a helical path, the particle will (a) never move parallel to the x-axis (b) move parallel to the x-axis once during every rotation for all values of θ (c) move parallel to the x-axis at least once during every rotation if θ = 45º (d) never move perpendicular to the x-direction

A charged particle is fired at an angle θ to a uniform magnetic fiel

1.	A charged particle is fired at an angle θ to a uniform magnetic field directed along the x-axis. During its motion along a helical path, the particle will (a) never move parallel to the x-axis (b) move parallel to the x-axis once during every rotation for all values of θ (c) move parallel to the x-axis at least once during every rotation if θ = 45º (d) never move perpendicular to the x-direction
Answer» Correct Answer is: (a, d)