A particle of mass m and charge q, moving with velocity V enters Region II normal to the boundary as shown in the fig. Region II has a uniform magnetic field B perpendicular to the plane of the paper. Length of the Region II is. Choose the correct choice (s)

The particle enters Region III only if its velocity, `V > (qlB)/m`
The particle enters Region III only if its velocity, `V > (qlB)/m`
Path length of the particle is Region II is maximum when velocity, `V = (qlB)/m`
Time spend in Region II is same for any velocity, V as long as the particle returns to Region I