An aeroplane is moving north horizontally , with a speed of $200 ms^{-1}$ ,at a place where the vertical component of the earth's magnetic field is $0.5 \times 10^{-4}\;T$ .What is the induced e.m.f set up between the tips of the wings, if they are 10 m apart ?

Question

$\begin{array}{1 1} 0.01\;v \\ 0.1\;v \\ 1\;v \\ 10\;v \end{array}$