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A particle of charge per unit mass \( \alpha \) is released from origin with a velocity \( \vec{v}=v_{0} \hat{\imath} \) in a uniform magnetic field \( \vec{B}=-B_{0} \hat{k} \). If the particle passes through \( (0, y \), 0 ) then \( y \) is equal to
(1) \( -\frac{2 v_{0}}{B_{0} \alpha} \)
(2) \( \frac{v_{0}}{B_{0} \alpha} \)
(3) \( \frac{2 v_{0}}{B_{0} \alpha} \)
(4) \( -\frac{v_{0}}{B_{0} \alpha} \)
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