An airplane is flying due north at 180 m/s. Earth's magnetic field has a northward component of

Question:

An airplane is flying due north at 180 m/s. Earth's magnetic field has a northward component of 0.30 mT and an upward component of 0.38 mT.
(a) If the wingspan (distance between the wingtips) is 46 m, what is the motional emf between the wingtips?
(b) Which wingtip is positively charged?