Question: An automobile has a vertical radio antenna 1.2m long. The automobile travels at 65.0 km/h on a horizontal road where the Earth's magnetic field is 50.0 mT directed toward the north and downward at an angle of 65.0 degrees below horizontal. calculate the magnitude of the induced emf. I know that when a conducting bar of length l moves through a magnetic field B with a velocity of v so that v is perpendicular to B the emf is induced in the bar (called a motional emf) E = -Blv I'm stumped because this law only applies when the velocity and the magnetic field are perpendicular, and in this problem they are not. If anyone can explain this that would be awesome.