Answer
$7.7\times10^{-6}N$
Work Step by Step
The airplane’s velocity is perpendicular to the magnetic field, so the magnetic force is maximum. The magnitude is given in equation 20–4.
$$F_{max}=qvB$$
$$=(1280\times10^{-6}C)(120m/s)(5.0\times10^{-5}T)$$
$$=7.7\times10^{-6}N$$
