A charge ` +Q` is uniformluy distributed over a thin ring with radus ` R. a` negative point charge -Q and mass `m` starts from rest at a pont far away from the centre of the ring and moves towardsn then centre. Find the velocity of this particle at the moment it passes through the centre of the ring .

A charge ` +Q` is uniformluy distributed over a thin ring with radus `

1.	A charge ` +Q` is uniformluy distributed over a thin ring with radus ` R. a` negative point charge -Q and mass `m` starts from rest at a pont far away from the centre of the ring and moves towardsn then centre. Find the velocity of this particle at the moment it passes through the centre of the ring .
Answer» Correct Answer - ` sqrt (2 k q^2)/( mR)` From energy conservation Loss of `PE` = gain of `KE` ` Q. (KQ)/R = 1/2 mv^2 rArr v= sqrt((2 KA^@ )/(mR))`.

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