a jet plane is travelling west at 450 ms^-1. if the horizontal component of earth's magnetic field at that place is 4 * 10^-4 Tesla and the angle of dip is 30 degrees, find the emf induced between the ends of the wings having span of 30 m.

let velocity of plane  v = 450 m/s.

wingspan l = 30 m.

mag. Field  B = 4 × 10^-4 T

angle of dip α = 30^∙

therefore vertical component B_v = B sin α

  = 4 × 10^-4 × sin 30^∙

               B_v = 2 × 10^-4 T

Motional EMF ε = B_v l v

  = 2 × 10^-4  × 30 × 450

  = 27000 × 10^-4  

                       ε = 2.7 Volts