Physics

Problem

A proton of speed

1.0\times10^{7}\,\text{m s}^{-1}

enters a

0.20\,\text{T}

magnetic field at an angle of

60^{\circ}

. After completing exactly five turns of its helical trajectory, the total length of the path traced by the proton is closest to a)

14.2\,\text{m}

16.4\,\text{m}

8.7\,\text{m}

20.0\,\text{m}