A proton of mass m and charge +e is movi...

A proton of mass m and charge `+e` is moving in a circular orbit in a magnetic field with energy `1 MeV`. What should be the energy of alpha-particle (mass=`4m` and charge=`+2e`), so that it can revolve in the path of same radius?

`1` MeV

`4` MeV

`2` MeV

`0.5` MeV

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