Question

An aircraft with a wing-span of 40 m flies with a speed of 1080 km $h^{-1}$ in the eastward direction at a constant altitude in the northern hemisphere, where the vertical component of earth's magnetic field is 1.75 ´ ${10}^{-5}$T. Then the emf that develops between the tips of the wings is

• A. 0.5 V
• B. 0.35 V
• C. 0.21 V
• D. 2.1 V

Answer 1

The correct option is C 0.21 V

L=40 m, v=1080km $h^{-1}=300mse{c}^{-1}$ and B=$1.75\times {10}^{-5}T\Rightarrow$
e=Blv=$1.75\times {10}^{-5}\times 40\times 300=0.21V$