Physics

Problem

A proton (charge

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

) moves due north with a speed of

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

in a region where a uniform magnetic field of magnitude

0.40\,\text{T}

is present. Determine how this magnetic field must be oriented so that the proton experiences no magnetic force.