Physics - Magnetism Question with Solution | TestHub

According to Fleming's left hand rule direction of force is along $y$ axis when is perpendicular to wire: $$\vec{F}=Q(\vec{V}\times \vec{B})$$ $\mathrm{B}$ due to $\mathrm{I}$ is acting inwards is into the paper, $v$ is along or: $$\begin{array}{ll}\therefore & F=a+\left|\begin{array}{ccc}\hat{i}& \hat{h}& \hat{k}\\ v& 0& 0\\ 0& 0& -\mathrm{B}\end{array}\right|\\ \Rightarrow & F=Q+[-j(-vB)+0]\\ \therefore & F=QvB\hat{j}\end{array}$$ in $y$ direction.