Along \(x L =v_x t=\sqrt{\frac{ e }{ m }} t\)
Along y \(v _{ y }=\frac{e e }{ m } t\)
\(\operatorname{dividing} \frac{ v _{ y }}{ L }= E \sqrt{\frac{ e }{ m }}= Ev _{ x }\)
\(\Rightarrow \operatorname{Tan} \theta=\frac{ v _{ y }}{ v _{ x }}= E \times L =10 \times 0.1=1\)
\(\theta=45^{\circ}\)