Assertion (A): A proton and an electron enter a uniform magnetic field B with the same momentum p such that p is perpendicular to B. They describe…

Assertion (A) : A proton and an electron enter a uniform magnetic field $\displaystyle \overrightarrow{\mathrm{B}}$ with the same momentum $\displaystyle \overrightarrow{\mathrm{p}}$ such that $\displaystyle \overrightarrow{\mathrm{p}}$ is perpendicular to $\displaystyle \overrightarrow{\mathrm{B}}$. They describe circular paths of the same radius. Reason (R) : In a magnetic field, orbital radius r is equal to $\displaystyle \frac{\mathrm{p}}{\mathrm{qB}}$.