Physics

Problem

A proton of charge

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

moves with speed

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

in a uniform magnetic field of magnitude

0.20\,\text{T}

. The angle between the velocity and the field is

30^{\circ}

. The magnitude of the magnetic force on the proton is closest to a)

9.6\times10^{-14}\,\text{N}

2.4\times10^{-14}\,\text{N}

4.8\times10^{-14}\,\text{N}

8.3\times10^{-14}\,\text{N}