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Dipole Moment

A ball of mas...

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A ball of mass 1g and charge 10^{-8} C moves from point A,where potential is 600V to the point where potential is zero.Velocity of the ball at point B is 20cm/s.The velocity of the ball at point A will be a)22.8 cm/s b)228 cm/s c)16.8 cm/s d)168 cm/

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