A particle of mass M and positive charge Q, moving with a constant velocity u, = 4ms, 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 velocity = 2(3i+j) m/s. The correct statement(s) is (are) (A) The direction of the magnetic field is -z direction. (B) The direction of the magnetic field is +z direction. 50M (C) The magnitude of the magnetic field 3Q (D) The magnitude of the magnetic field is units. 100M 3Q units.