(a) A dc power line for a light-rail system carries [tex]1000 \mathrm{~A}[/tex] at an angle of [tex]30.0^{\circ}[/tex] to Earth's [tex]5.0 \times 10^{-5} \mathrm{~T}[/tex] field. What is the force on a [tex]100-m[/tex] section of this line? (b) Discuss practical concerns this presents, if any.
