Q. An aircraft having awing span of 10 m flies at a speed of 720 kmph. If the vertical component of the earth's magnetic field is 3 X 10-5 T, calculate the emf induced between the ends of the wings.
Solution : e = - B l v
= - 3 × 10-5 × 10 × 720 × 5 / 18
e = - 0.06 volt
Negative sign is due to Lenz law.