A particle of mass m and charge q moves with a constant velocity v alo – McqOptions

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1.	A particle of mass m and charge q moves with a constant velocity v along the positive x direction. It enters a region containing a uniform magnetic field B directed along the negative z direction, extending from x = a to x = b. The minimum value of v required so that the particle can just enter the region \[x>b\] is [IIT-JEE (Screening) 2002]
A.	\[qb\,B/m\]
B.	\[q(b-a)B/m\]
C.	\[qa\,B/m\]
D.	\[q(b+a)B/2m\]
Answer» C. \[qa\,B/m\]

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