Magnetics

A proton with a kinetic energy of \(2.0 ~\mathrm{eV}\) moves into a region of uniform magnetic field of magnitude \(\frac{\pi}{2} \times 10^{-3} \mathrm{~T}\). The angle between the direction of magnetic field and velocity of proton is \(60^{\circ}\). The pitch of the helical path taken by the proton is __________ \(\mathrm{cm}\). (Take, mass of proton \(=1.6 \times 10^{-27} \mathrm{~kg}\) and Charge on proton \(=1.6 \times 10^{-19} \mathrm{C}\) ).