A beam of protons moving with a velocity of `4 times 10^(5)ms^(-1)`, enters a uniform field of 0.3T at an angle of `60^(@)` to the direction of the magnetic field. Find (i) the radius of the helical path of the proton beam and (ii) pitch of the helix. (Mass of proton =`1.67 times 10^(-27)kg`, charge on proton `=1.6 times 10^(-19)C`).

Options

A. 6 cm
B. 4.38 cm
C. 6.34 cm
D. 3.46 cm