$($a$)$ A jet airplane with a $75\mathrm{.}0$ m wingspan is flying at $280$ m$/$s$.$ What emf is induced between wing tips if the vertical component of the Earth$$s field is $3\mathrm{.}00105$T$3\mathrm{.}00105$T$?($b$)$ Is an emf of this magnitude likely to have any consequences? Explain.