Q. An aircraft having awing span of 20.48 m flies at a speed of 40 ms-1. If the vertical component of the earth's magnetic field is 2 X 10-5 T, compute the emf induced between the ends of the wings.
Data: l = 20.48 m; v = 40 ms-1; B = 2 × 10-5T; e = ?
Solution: e = - B l v = - 2 × 10-5 × 20.48 × 40
e = - 0.0164 volt
Negative sign is due to Lenz law.