JEE Advanced 2013 Physics question
A particle of mass M and positive charge Q, moving with a constant velocity , enters a region of uniform static magnetic field normal to the x-y plane. The region of the magnetic field extends from x = 0 to x = L for all values of y. After passing through this region, the particle emerges on the other side after 10 milliseconds with a velocity . The correct statement(s) is (are)
Answer: (A),(C)
Solution
The speed stays 4 m/s (as it must in a magnetic field) and the velocity turns from to , i.e. through 30° = π/6 towards +y. The initial force on the positive charge must be along +y: , which requires $
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