A particle of mass $m$ and charge $q$ , moving with velocity $V$ enters region $II$ normal to the boundary as shown in the figure. Region $II$ has a uniform magnetic field $B$ perpendicular to the plane of the paper. The length of the region $II$ is $l$ . Choose the not correct choice
A particle of mass $m$ and charge $q$ , moving with velocity $V$ enters region $II$ normal to the boundary as shown in the figure. Region $II$ has a uniform magnetic field $B$ perpendicular to the plane of the paper. The length of the region $II$ is $l$ . Choose the not correct choice
- A
The particle enters Region $III$ only if its velocity $V > \frac{{qlB}}{m}$
- B
The particle enters Region $III$ only if its velocity $V < \frac{{qlB}}{m}$
- C
Path length of the particle in Region $II$ is maximum when velocity $V = \frac{{qlB}}{m}$
- D
Time spent in Region $III$ is same for any velocity $V$ as long as the particle returns to Region $I$
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- [JEE MAIN 2019]