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A particle of charge ‘q’ & mass ‘m’ enters normally (at point P) in a region of magnetic field with speed v. It comes out normally from Q after time T as shown in Fig. The magnetic field B is present only in the region of radius R and is uniform. Initial and final velocities are along radial direction and they are perpendicular to each other. For this to happen, which of the following expression (s) is/are correct.