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

Answer 1

Answer: (A), (C)

Both e and p will travel in semicircular path.
Since, m is different, and hence time will be different.