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An electron of mass me and a proton of m...

An electron of mass `m_e` and a proton of mass `m_p` are injected into a uniform magnetic field at right angles to the direction of the field, with equal velocity. The ratio of the radii of their orbits `r_e//r_p` is equal to

A

2

B

`m_e//m_p`

C

1

D

`m_p//m_e`.

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