an electron is moving along positive X- axis You want to apply a magnetic field for a short time so that the electron mayn reverse its direction and move parallel to the negative X- axis this can be done by applying the magnetic field along which axis?
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1 Answers
1A magnetic field in any direction along the plane perpendicular to the direction of the electron will suffice.
The electron will move in circular motion and as soon as the half circle is completed, we may remove the magnetic field.