Magnetics 1 Question 11

11. 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

(2002,2M)

(a) qbBm

(b) q(ba)Bm

(c) qaBm

(d) q(b+a)B2m

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Answer:

Correct Answer: 11. (b)

Solution:

  1. If (ba)r

( r= radius of circular path of particle)

The particle cannot enter the region x>b.

So, to enter in the region x>b

r>(ba) or mvBq>(ba) or v>q(ba)Bm



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