A particle of charge per unit mass $\alpha$ is released from origin with a velocity $\bar{v}=v_0 \vec{i}$ in a uniform magnetic field $\bar{B}=-B_0 \hat{k}$. If the particle passes through $(0, y, 0)$ then $y$ is equal to
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(c)
$\frac{q}{m}=\alpha$
$y=2 R=2\left(\frac{m v}{q B}\right)=\frac{2 v_0}{\alpha B_0}$
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