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A proton moving with a velocity of 2 xx ...

A proton moving with a velocity of `2 xx 10^6 ms^-1` describes a circle of radius `R` in a magnetic field. The speed of an `alpha`-particle to describe a circle of same radius in the same magnetic field is

A

`1 xx 10^6 m s^-1`

B

`2 xx 10^6 m s^-1`

C

`4 xx 10^6 m s^-1`

D

`8 xx 10^6 m s^-1`.

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