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The magnetic field in a certain region o...

The magnetic field in a certain region of space is given by `B=8.35 xx10^(-2) hati T.`A proton is shot into the field with velocity `v=(2xx10^(5)hati+4xx10^(5)hatj)m//s.` the proton follows a helical path in the field. The distance moved by proton in the x-direction during the period of one revolution in the yz-plane will be ( mass of proton`=1.67 xx 10^(-27) kg)`

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