WBJEE 2021 Physics and Chemistry Solved Paper

Category III (Q36 to Q40)

Carry 2 marks each and one or more option (s) is/are correct. If all correct answers are not marked and also no incorrect answer is marked then score = 2 × number of correct answers marked  actual number of correct answers. If any wrong option is marked or if any combination including a wrong option is marked, the answer will be considered wrong, but there is no negative marking for the same and zero mark will be awarded.

Question : 39 of 80

Marks: +1, -0

A particle of mass m and charge q moving with velocity v enters region-b form region-a along the normal to the boundary as shown is the figure. Region-b has a uniform magnetic field B perpendicular to the plane of the paper. Also, region-b has length L. Choose the correct statements:

The particle enters region-c only if v>
qLB
m
The particle enters region-c only if v<
qLB
m
Path of the particle is a circle in region-b
Time spent in region −b is independent of velocity v

Validate

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