A particle of mass M and positive charge Q, moving with a constant velocity ${\vec{u}}_1=4\hat{i}m{s}^{-1},$ enters a region of uniform static magnetic field normal to the x-y plane The region of the magnetic field extends from x=0 to x=L for all values of y. After passing through this region, the particle emerges on the other side after 10 milliseconds with a velcoity ${\vec{u}}_2=2\left(\sqrt{3\hat{i}}+\hat{j}\right)m{s}^{-1}.$ The correct statement(s) is (are)

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