Four point charges + 8 mC, – 1 mC and + 8 mC are fixed at the points -√(27/2) m,-√(3/2) m,+√(3/2) m and+√(27/2) m respectively on the y-axis. A particle of mass 6 × 10-4 Kg and charge + 0.1mC moves along the –x direction. Its speed at x = + ¥ is V0. Find the least values of V0 for which the particle will cross the origin. Find also the kinetic energy of the particle at the origin. Assume that space is gravity free. 1/4p Î0 = 9 × 109 Nm2/C2.
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