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A charged particle of charge \( q \) and mass \( m \) moving along positive \( \mathrm{x} \)-direction with a velocity \( \mathrm{v} \) enters a region where there is a uniform magnetic field \( B_{0}(-\hat{k}) \), from \( x=0 \) to \( x=d \). The particle gets deflected through an angle \( \theta \) from its initial path. The specific charge of the particle is
(1) \( \frac{v \cos \theta}{B d} \)
(2) \( \frac{v \sin \theta}{B d} \)
(3) \( \frac{u \tan \theta}{\mathrm{Bd}} \)
(4) \( \frac{u}{B d} \)
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