The direction of magnetic force on the electron as shown in the diagram is along
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Magnetic field is in $(cap-k)$ direction So direction of force
$\overrightarrow{\mathrm{F}}=\mathrm{q} \overrightarrow{\mathrm{v}} \times \overrightarrow{\mathrm{B}}$
$\hat{F}=-[-\hat{i} \times(-\hat{k})]=\hat{j}$
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