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The coordinate \( y_{n} \) of the particle when it crosses the \( y \)-axis for the \( n^{\text {th }} \) time is
(1) \( \frac{2 \pi^{2} m n^{2} E}{q B^{2}} \)
(2) \( \frac{\pi^{2} m n^{2} E}{q B^{2}} \)
(3) \( \frac{2 \pi^{2} m n^{2} E}{3 q B^{2}} \)
(4) \( \frac{\sqrt{3} \pi^{2} m n^{2} E}{q B^{2}} \)
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