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 :

y -

axis

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z -

axis

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y -

axis only

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z -

axis only

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Solution

The correct options are
A $y -$ axis
B $z -$ axis
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 $- v e x -$ axis.
$B$ along $z -$ axis: circle in $x y$ plane, at some point particle will be moving along $- v e x -$ axis.

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