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A charge particle of mass \( m \& \) charge \( -q \) is released on the axis of ring (charge \( Q \), mass \( M \) and radius \( 3 R \) ) at a distance \( 4 R \) from the center. What will be the velocity of charge particle when it reaches to the center of ring?
(a) Zero
(b) \( \sqrt{\frac{q Q}{15 \pi \varepsilon_{0} m R}} \)
(c) \( \sqrt{\frac{2 q Q}{5 \pi \varepsilon_{0} m R}} \)
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