A positively charged particle moving along +X axis, enters a region of uniform magnetic field directed vertically upward in +Z direction. The particle will ____

move in a circular path with a uniform speed

The correct answer is Option (2) → move in a circular path with a uniform speed

Magnetic force on a moving charge: $\vec{F} = q \vec{v} \times \vec{B}$

Given: velocity along +X, magnetic field along +Z

Force direction: $+Y$ (using right-hand rule for positive charge)

The magnetic force is always perpendicular to velocity → speed remains constant → circular motion in XY-plane.

Correct option: move in a circular path with a uniform speed