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A proton with a kinetic energy of 2.0 eV...

A proton with a kinetic energy of 2.0 eV moves into a region of uniform magnetic field of magnitude ``pi`/2 xx 10^-3` T. The angle between the direction of magnetic field and velocity of proton is `60^@`.The pitch of the helical path taken by the proton is _____ cm.(Take,mass of proton = `1.6 xx 10^-27` kg and charge on proton= `1.6 xx 10^-19` C.

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