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An electron is moving along the positive $x - a x i s$ . 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 $x - a x i s$ . This can be done by applying the magnetic field along,

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$y - a x i s o n l y$

$z - a x i s$

$y - a x i s$

$z - a x i s o n l y$

answer is A, B.

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Detailed Solution

Electron stream can reverse the direction either through $x y - p l a n e$ of through $x z - p l a n e .$ According to Fleming's left hand rule the magnetic field either along $z - a x i s$ or along $y -$ axis.

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