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IIT JEE Advanced 2008 Paper 1

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Question : 8

Total: 69

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 correct choice(s).

The particle enters Region III only if its velocity is V >
qlB
m
.
The particle enters Region III only if its velocity V <
qlB
m
.
Path length of the particle in Region II is maximum when velocity V =
qlB
m
.
Time spent in Region II is same for any velocity V as long as the particle returns to Region I.

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