Challenging Physics Question?

Question

A Boeing 747 jet with a wingspan of 60m is flying horizontaly at a speed of 300m/s over Phoenix, Arizona at a location where the Earth's magnetic field is 50 micro tesla at 58 degrees below the horizontal. What voltage is generated between the wingtips ?

Answer 1

Let L=length of wingspan
"x" is the cross-product

v=-L(v x B) -60(300*50E-6)sin(58)=-0.76 V