Two particles of masses $$m_1$$ and $$m_2$$ carry identical charges. Starting from rest they are accelerated through the same potential difference. Then they enter into a region of uniform magnetic field and move along circular paths of radii $$R_1$$ and $$R_2$$ respectively. Therefore, the ratio of their masses $$m_1 \colon m_2$$ is

A

$$R_1 \colon R_2$$

B

$$R_1^2 \colon R_2^2$$

C

$$R_2^2 \colon R_1^2$$

D

$$\sqrt{R_1} \colon \sqrt{R_2}$$