A particle of charge "7.5 mC is released from rest at the
Chapter , Problem 41(choose chapter or problem)
A particle of charge "7.5 mC is released from rest at the point x $ 60 cm on an x axis. The particle begins to move due to the presence of a charge Q that remains fixed at the origin. What is the kinetic energy of the particle at the instant it has moved 40 cm if (a) Q $ "20 mC and (b) Q $ '20 mC?
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