A proton beam enters magnetic field of 1...

A proton beam enters magnetic field of `10^(-4) "Wb//m^(2)` normally. If the specific charge of the proton is `10^(11) C//kg` and its velocity is `10^(9)m//s` then the radius of the circle described will be

100 m

0.1 m

1 m

10 m

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