An electron is moving along the positive \( X \)-axis. You want to apply a magnetic field for a ...

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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
(a) Y-axis
(b) \( Z \)-axis
(c) Y-axis only
(d) Z-axis only
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