question_answer

A beam of protons with velocity \[4\times {{10}^{5}}\text{ }m/s\]enters a uniform magnetic field of \[0.3\] tesla at an angle of \[60{}^\circ \] to the magnetic field. Find the radius (in cm) of the helical path taken by the proton beam. (mass of proton\[=1.67\times {{10}^{-27}}\text{ }kg\].)

Answer:

1.2