A particle of charge -q and mass 
enters a uniform magnetic field B (perpendicular to paper inwards) at P with a speed v 0 at an angle α and leaves the field at Q with speed v at angle β as shown in the figure. Then,
A
B
C
D
particle remains in the field for time 
Text Solution
Verified by ExpertsThe correct answer is:
D
From the question, 
Here, 
and 
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