Physics

Problem

A proton (

m=1.67\times10^{-27}\,\text{kg}

q=1.6\times10^{-19}\,\text{C}

) enters a

0.10\,\text{T}

uniform magnetic field with speed

2.0\times10^{6}\,\text{m s}^{-1}

, making an angle of

45^{\circ}

with the field direction. The radius of the circular component of its path is closest to a)

0.30\,\text{m}

0.15\,\text{m}

0.11\,\text{m}

0.21\,\text{m}