This is a Magnetic Field effect problem. please give the solution.

A 7Li nucleus has a charge equal to +38 and a mass that is equal to the mass of seven protons. A7Li nucleus and a proton are both moving perpendicular to a uniform magnetic eld. The magnitude of the momentum of the proton is equal to the magnitude of the momentum of the nucleus. Find the ratios of the path of radius of curvature Rp and RLi