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  4. An electron having a charge e moves with a velocity v in positive x direction. A magnetic field acts on it in positive y direction. The force on the electron acts in (where outward direction is taken as positive z-axis).

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Q. An electron having a charge $e$ moves with a velocity $v$ in positive $x$ direction. A magnetic field acts on it in positive $y$ direction. The force on the electron acts in (where outward direction is taken as positive z-axis).

Moving Charges and Magnetism

Solution:

image
$\vec{F}=-e(\vec{v} \times \vec{B})$
So using right hand thumb rule
$\vec{F}$ will be in $-z$ direction.