An electron and a proton moving on a straight parallel paths with s...

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An electron and a proton moving on a straight parallel paths with same velocity enter a semi-infinite region of uniform magnetic field perpendicular to velocity.
- Which of these are correct?
I. They will never come out of magnetic field region.
II. They will come out travelling along parallel paths.
III. They will come out same time.
IV. They will come out at different times.
(a) I and II
(b) II and III
(c) II and IV
(d) I and IV
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