Question

An aeroplane in which the distance between the tips of the wings in $50 \, m$ is flying horizontally with a speed of $360 \, km \, h^{- 1}$ over a place where the vertical component of Earth's magnetic field is $2\times 10^{- 4}$ $Wb \, m^{- 2}$ . The potential difference between the tips of the wings would be

• A. $0.1 \, V$
• B. $1.0 \, V$
• C. $0.2 \, V$
• D. $0.01 \, V$

Answer 1

Answer: (B)

Here, $l=50 \, m, \, v=360 \, km \, h^{- 1}=100 \, m \, s^{- 1}$
$B=2\times 10^{- 4} \, Wb \, m^{- 2}$
Potential difference $e=Blv=2\times 10^{- 4}\times 50\times 100=1 \, V$