. A particle of mass m and charge q travels in a circular path of radius 26 cm perpendicular to a uniform magnetic field
of unknown strength. The particle travels with a constant speed of 5 \times 10 6 m/s. A second particle, with mass 4m
and charge 2q, travels at the same speed as the first particle, also travels in a circular path perpendicular to the same
magnetic field. What is the radius of the second particle’s circular path?