Question

A jet plane is travelling towards west at a speed of 1600 km/h. What is the voltage difference developed between the ends of the wing having a span of 25 m, if the Earths magnetic field at the location has a magnitude of 5 $\times {10}^{-4}$ T and the dip angle is ${30}^o$.

• A. 4.1 V
• B. 2.2 V
• C. 3.2 V
• D. 3.8 V

Answer 1

Answer: (C)

3.2 V

Vertical component of B,

$B\sin \delta =5\times {10}^{-4}\times \sin \left(30\right)=2.5\times {10}^{-4}T$

EMF, $E=Blv$

$E=2.5\times {10}^{-4}\times 25\times 1800\times \frac{5}{18}=3.125V$