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The region between x=0 and x=L is filled...

The region between x=0 and x=L is filled with uniform steady magnetic field` B_0hatk`. A particle of mass m, positive charge q and velocity `v_0hati` travels along x-axis and enters the region of the magnetic field. Neglect the gravity throughout the question.
Find the value of `L` if the particle emerges from the region of magnetic field with its final velocilty at an angel `30^@ `to its initial velocity.

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