The force on an electron moving in a magnetic field will be the largest when its direction is

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The force on a charged particle moving in a magnetic field is given by the Lorentz force law, which states that the force is proportional to the cross product of the velocity of the particle and the magnetic field. This force is maximum when the angle between the velocity of the particle and the magnetic field is 90 degrees, i.e., when they are perpendicular to each other.

The Force on an Electron Moving in a Magnetic Field