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The figure shows a region of length ‘l’ ...

The figure shows a region of length ‘l’ with a uniform magnetic field of 0.3 T in it and a proton entering the region with velocity `4xx10^(5) " ms"^(-1)` making an angle `60^(@)` with the field. If the proton completes 10 revolution by the time it cross the region shown, ‘l’ is close to (mass of proton =` 1.67 xx10^(27)` kg , charge of the proton ` =1.6 xx10^(-19) ` C )

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