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Q. An electron moves with velocity $\vec{v}$ in $X$ - direction. An electric field acts on it in $Y$- direction. The force on the electron acts in

Electric Charges and Fields

Solution:

$\vec{F}=q \vec{E},$ here $\vec{E}=E \hat{j} \Rightarrow \vec{F}=(-e) E \hat{j}$
or $\vec{F}=-(e E) \hat{j}$