Four identical positive point charges Q are fixed at the four corners of a square of side length l. Another charged particle of mass m and charge +q is projected towards centre of square from a large distance along the line perpendicular to plane of square. The minimum value of initial velocity v_(0) (in m/s) required to cross the square is ? (m = 1 gm, l = 4 sqrt(2) m, Q =1 mu c, q = 0.5 muc)

Four identical positive point charges Q are fixed at the four corners

1.	Four identical positive point charges Q are fixed at the four corners of a square of side length l. Another charged particle of mass m and charge +q is projected towards centre of square from a large distance along the line perpendicular to plane of square. The minimum value of initial velocity v_(0) (in m/s) required to cross the square is ? (m = 1 gm, l = 4 sqrt(2) m, Q =1 mu c, q = 0.5 muc)
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