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An electron is moving along the positive...

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 nagative x-axis. This can be done by applying the magnetic field along

A

`Y`-axis

B

`X` -axis

C

`Y`-axis only

D

None of these

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The correct Answer is:
A
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