An electron is moving along positive $x$-axis.Auniform electric field exists towards negative $y$-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero
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$\overrightarrow{F_{e}}+\overrightarrow{F_{m}}=0$
$q \vec{E}+q(\vec{V} \times \vec{B})=0 \Rightarrow \vec{E}+\vec{V} \times \vec{B}=0$
$E(-\hat{j})+V B(\hat{i} \times \widehat{n})=0 \Rightarrow \hat{i} \times \widehat{n}$
should be in $\hat{j} . S o \widehat{n}=-\hat{k}$
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