A proton of mass `1.67xx10^(-27)` kg charge `1.6xx10^(-19) C` is projected in xy-plane with a speed of `2xx10^(6) m//s` at an angle of `60^(@)` to the X-axis. If a uniform magnetic field of 0.14 T is applies along the Y-axis, then the path of the proton is

Options

A. a circle of radiuis 0.2 m and time period `pixx10^(-7)s`
B. a circle of radius 0.1 m and time period `2pixx10^(-7)s`
C. a helix of radius 0.07 m and time period `0.5xx10^(-6)s`
D. a helix of radius 0.14 m and time period `1.0xx10^(-7)s`

Answer

C