An electron is moving along the positive X-axis. You want to apply a magnetic field for the 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
Z-axis
Y-axis only
Z-axis only
A
Y-axis
B
Z-axis
C
Y-axis only
D
Z-axis only
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Solution
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Force on charged particle due to magnetic field is F=q(→v×→B) Hence, to reverse the direction of electron from positive X-axis to the direction parallel to the negative X-axis, magnetic field should be applied along Y-axis or Z-axis.
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