A proton with a kinetic energy of \( 2.0 \, \text{eV} \) moves into a region of uniform magnetic field of magnitude \( \dfrac{\pi}{2} \times 10^{-3} \, \text{T} \). 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 ________ \( \text{cm} \). (Take, mass of proton \( = 1.6 \times 10^{-27} \, \text{kg} \) and Charge on proton \( = 1.6 \times 10^{-19} \, \text{C} \).)
