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A beam of protons moving with a velocity of `4 xx 10^(5) m/s` enetrs a uniform magnetic field of 0.3 T at an angle of 60◦ with the magnetic field. What is the radius of the helical path described by the proton beam?`[m_p=1.67 xx 10^(-27) kg` and the charge on the proton`=1.6 xx 10^(-19)`C]

A

2 cm

B

12 cm

C

4 cm

D

5 cm

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