Magnetics 1 Question 9

9. An electron moving with a speed u along the positive x-axis at y=0 enters a region of uniform magnetic field B=−B0k^ which exists to the right of y-axis. The electron exits from the region after sometime with the speed v at coordinate y, then

(2004, 2M)

(a) v>u,y<0

(b) v=u,y>0

(c) v>u,y>0

(d) v=u,y<0

Show Answer

Answer:

Correct Answer: 9. (d)

Solution:

  1. Magnetic force does not change the speed of charged particle. Hence, v=u. Further magnetic field on the electron in the given condition is along negative y-axis in the starting. Or it describes a circular path in clockwise direction. Hence, when it exits from the field, y<0.
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