A positively charged particle moving along +X axis, enters a region of uniform magnetic field directed vertically upward in +Z direction. The particle will ____
Answer & explanation
Correct answer: option 2
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