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The angle \( \alpha \) between the particle's velocity vector and \( y \)-axis at that moment is
(1) \( \tan ^{-1}\left(\frac{3 v_{0} B}{2 \pi n E}\right) \)
(2) \( \tan ^{-1}\left(\frac{v_{0} B}{\pi n E}\right) \)
(3) \( \tan ^{-1}\left(\frac{v_{0} B}{\sqrt{2} \pi n E}\right) \)
(4) \( \tan ^{-1}\left(\frac{v_{0} B}{2 \pi n E}\right) \)
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