Find out minimum velocity of projection of charged particle so that it reaches to centre of ring and cross it when ring is free to move. Ring has equally charge Distribution of +Q
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Explanation:
A charge +Q is uniformly distributed in a spherical volume of radius R. A particle of charge + q and mass m projected with velocity v
o
from the surface of the spherical volume to its centre inside a smooth tunnel dug across the sphere, The minimum value of v
o
such that it just reaches the centre (assume thatthere is no resistance on the particle except electrostatic force) of the spherical volume is
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