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A beam of electrons enters a uniform mag...

A beam of electrons enters a uniform magnetic field of `0*3T` with a velocity of `4xx10^5ms^-1` at an angle of `60^@` to the field. Find the radius of the helical path taken by the beam. Also find the pitch of the helix (distance travelled by a proton parallel to the magnetic field during one period of rotation). Mass of proton is `1*67xx10^(-27)kg`.

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