A proton carrying 1 MeV kinetic energy i...

A proton carrying `1 MeV` kinetic energy is moving in a circular path of radius `R` in unifrom magentic field. What should be the energy of an `alpha-` particle to describe a circle of the same radius in the same field?

0.5 MeV

4 Me V

2 Me V

1 Me V

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