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 true?
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Figure shows that the magnetic field 
is present on the right- hand side of AB. The electron (e) and proton (p) moving on straight parallel paths with the same velocity enter the region of uniform magnetic field.
The entry and exit of electron & proton in the magnetic field makes the same angle with AB as shown.
Therefore both will come out travelling in parallel paths.
The time taken by proton
The time taken by electron is
clearly 
is not equal to 
as 
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