An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of
radii re, rp, r$_\alpha$ respectively in a uniform magnetic field B. The relation between re, rp, r$_\alpha$ is:
re < r$_\alpha$ < rp
re > rp = r$_\alpha$
re < rp = r$_\alpha$
re < rp < r$_\alpha$
Solution
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