Multiple choice

A plane of wingspan 30 m flies through a vertical field of strength 5 x 10-4 T. Calculate the emf induced across wing tips if its velocity = 150 ms-1.

  1. 0.0001 V

  2. 2.25 V

  3. 0.0025 V

  4. 0.09

  5. 0.44 V

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Area = 30 x 150 = 4500 m2. Flux = ɸ= BA = 5 x 10-4 x 4500 = 2.25 Wb. So induced emf is E = Δɸ / Δt = 2.25 / 1= 2.25 V.