A beam of protons with speed 4 \times 10^{5}\:ms^{-1} enters a uniform magnetic field of 0.3 T at an angle of 600 to the magnetic field. The pitch of the resulting helical path of protons is close to: (in cm) (Mass\; \:o\! f \; \:the \ :proton=1.67 \times 10^{-27}\:kg, charge \: \; o\! f \:proton=1.69\times 10^{-19}C
Option: 1 4
Option: 2 5
Option: 3 12
Option: 4 2

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