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A beam of protons with a velocity of 4 X...

A beam of protons with a velocity of `4 X 10 ^5 ms^(-1)` enters a uniform magnetic field of 0.3 T. The velocity makes an angle of `60^@` with the magnetic field. Find the radius of the helical path taken by the proton beam.

A

`3.7 xx 10^(-3) m`

B

`5.4xx 10^(-3) m`

C

`7. 6xx 10^(-2 )m`

D

`6.9 xx 10^(-2) m`

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