A charged particle entering a magnetic field from outside in a direction perpendicular to the field

Options

A. can never complete one rotation inside the field
B. may or may not complete one rotation in the field depending on it angle of entery into the field
C. will always complete exactly half of a rotation before leaving the field
D. may allow a helium path depending o its angle of entery into the field

Answer

A

Explanation

If width of magnetic field is small, particle emerges from other side

If magnetic field is large