A charged particle moves with a constant speed through a region where a uniform magnetic field is present.If the $\vec { B }$ field points straight upward,the magnetic force exerted on this particle will be strongest when the particle moves

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The magnetic force on a charged particle is given by the cross product of the velocity of the particle and the magnetic field, $\vec{F} = q\vec{v} \times \vec{B}$. The force is maximized when the angle between $\vec{v}$ and $\vec{B}$ is 90 degrees, which occurs when the particle moves in a plane parallel to Earth's surface, assuming $\vec{B}$ is vertical.

A Charged Particle Moves with a Constant Speed Through a Region