Q .     A proton travels few distance in an electric field, then it enters a crossed magnetic field of 1 T and radius 0.2 m. Find the velocity of proton.

AIIMS 2011
A

` 0.2\times 10^{ 8 }m s^{ -1 }`

B

`0.2\times 10^{ 7 }m s^{ -1 }`

C

` 0.2\times 10^{ 6 }m s^{ -1 }`

D

` 2\times 10^{ 7 }m s^{ -1 }`

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