Question

The path of a charged particle in a uniform magnetic field, when the velocity and the magnetic field are perpendicular to each other is a

• A. circle
• B. parabola
• C. helix
• D. straight line

Answer 1

Answer: (A)

The path of a charged particle in a uniform magnetic field depends upon the angle between the velocity $(\vec{v})$ and the magnetic field $(\vec{B})$.
When $\vec{v}$ and $\vec{B}$ are perpendicular to each other, the path of a charged particle is a circle. It is as shown in the figure.