A particle of mass m and charge q describes a circular path of radius R in a magnetic field. If its mass and charge were 2 m and q/2 respectively,…

A particle of mass $\displaystyle m$ and charge $\displaystyle \mathrm{q}$ describes a circular path of radius $\displaystyle \mathrm{R}$ in a magnetic field. If its mass and charge were $\displaystyle 2$ m and $\displaystyle \frac{\mathrm{q}}{2}$ respectively, the radius of its path would be