A metal airplane with a wingspan of 30 m flies horizontally along a north– south route in the northern hemi-sphere at a constant speed of in a region where the vertical component of the Earth’s magnetic field is 5.0 x 10-5 T.
(a) What is the magnitude of the induced emf between the tips of its wings?
(b) If the easternmost wing tip is negatively charged, is the plane flying due north or due south? Explain.