An airplane with a wingspan of 30.0 m flies due north at a location
where the downward component of the Earth's magnetic field is 0.60
x10-4 T. There is also a component pointing due north that has a
magnitude of 0.470 x10-4 T.
A- Find the difference in potential between the wing tips is the speed
of the plane is 250 m/s.
B- Which wingtip is positive?