Magnetic Effects of Current and Magnetism Part 2

A proton with a kinetic energy of 2.0‌eV moves into a region of uniform magnetic field of magnitude ‌

π

2

×10−3T. The angle between the direction of magnetic field and velocity of proton is 60∘. The pitch of the helical path taken by the proton is _______ cm.
(Take, mass of proton =1.6×10−27‌kg and Charge on proton =1.6×10−19C ) .