An electron is moving along $+x$ direction. To get it moving along an anticlockwise circular path in $x-y$ plane, magnetic field applied along
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$\&$ force is in anticlockwise direction
According to right hand palon rule
$\mathrm{F}=\mathrm{q}(\vec {\mathrm{V}} \times \vec {\mathrm{B}})$ magnetic field is in $+\mathrm{z}-$ direction.
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