JEE Advanced 2011 Physics question

An electron and a proton are moving on straight parallel paths with same velocity. They enter a semi-infinite region of uniform magnetic field perpendicular to the velocity. Which of the following statement(s) is/are true?

(A)They will never come out of the magnetic field region.
(B)They will come out travelling along parallel paths.Correct
(C)They will come out at the same time.
(D)They will come out at different times.Correct

Answer: (B),(D)

Solution

On entering the field perpendicular to it, each particle moves in a circle of radius ; the electron and proton curve in opposite directions (opposite charges) and with very different radii. Since the field occupies a half-space and each particle enters perpendicular to the boundary, each completes

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Question ID VK-025906