A deutron of K. E. 50 kev is describing a circular orbit of radius 0.5 m in a plane perpendicular to magnetic field `vecB`. The K.E. of the proton that describe a circular orbit of radius 0.5 m in the same plane with the same `vecB` is ......................
Options:
(a) 200 kev
(b) 100 kev
(c) 50 kev
(d) 25 kev