A proton is projected with a speed of `2 xx10^6 m/s` at an angle of `60^0` to the X-axis. If a uniform mag. field of 0.104 tesla is applied along Y-axis, the path of proton is ..................
Options:
(a) A circle of r 0.2m and time period `pixx10^(-7)` sec
(b) A circle of r 0.1m and time period`2pixx10^(-7)` sec
(c) A helix of r 0.1m and time period `2pixx10^(-7)` sec
(d) A helix of r 0.2m and time period `4pixx10^(-7)` sec