Question

Path of charged particle, if only magnetic force acts on it can be.

• A. circle
• B. helix with constant pitch
• C. helix with variable pitch
• D. cycloid

Answer 1

Answer: (A), (B)

The correct options are
A circle
B helix with constant pitch

If the velocity of the charged makes an angle $\theta$ with the direction of the magnetic field, ,due to component perpendicular to $\overrightarrow{B}$ , the particle moves in a circle. The component parallel to $\overrightarrow{B}$ provides motion along the $\overrightarrow{B}$.
Thus, the particle will have a helical path. In a uniform magnetic field, the pitch will be constant.