An electron has an initial velocity to the south but is observed to curve upward as the result of a magnetic field.This $\vec { B }$ field must have a component

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The magnetic force on a moving electron is given by the Lorentz force equation:$$\vec{F} = q\vec{v} 	imes \vec{B}$$where q is the charge of the electron, v is its velocity, and B is the magnetic field. The cross product means that the force is perpendicular to both v and B.In this case, the electron is moving to the south, so its velocity vector is in the negative y-direction. The magnetic field must be in the positive x-direction (to the west) in order to produce an upward force on the electron.

An Electron Has an Initial Velocity to the South but Is