An electron is moving along the positive $X$$-$axis. You want to apply a magnetic field for a short time so that the electron may reverse its direction and move parallel to the negative $X$$-$axis. This can be done by applying the magnetic field along
Diffcult
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If we apply the magnetic field either in $y$ or $z$ direction, the path will be a circle perpendicular to the magnetic field $B$.
$B$ along $y$ $-axis:$ circle in $x z$ plane, at some point particle will be moving along
$-ve$ $x$ $-axis.$
$B$ along $z$ $- axis:$ circle in $x y$ plane, at some point particle will be moving along
$-ve$ $x$ $-axis.$
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