An alternate electric field of frequency v, is applied across the dees `(radius=R)` of a cyclotron that is being used to accelerate protons `("mass"=m)`. The operating magnetic field (b) used in the cyclotron and the kinetic energy (K) of the proton beam, produced by it, are given by

Options

A. `B=(mv)/(e)` and `k=2mpi^(2)v^(2)R^(2)`
B. `B=(2pi mv)/(e)` and `K=m^(2)pi vR^(2)`
C. `B=(2pi mv)/(e)` and `k=2m pi^(2)v^(2)R^(2)`
D. `B=(mv)/(e)` and `k=m^(2)pi vR^(2)`