An air craft of wing span $40 \mathrm{~m}$ files horizontally in earth's magnetic field $5 \times 10^{-5}…
An air craft of wing span $40 \mathrm{~m}$ files horizontally in earth's magnetic field $5 \times 10^{-5} \mathrm{~T}$ at a speed of $500 \mathrm{~m} / \mathrm{s}$. The e.m.f. generated between the tips of the wings of the air craft is
$0.5 \mathrm{~V}$
$1 \mathrm{~V}$
$1.2 \mathrm{~V}$
$1.5 \mathrm{~V}$
Solution
The emf generated between the tips of the wings of the air craft is,
$\begin{aligned}
& \varepsilon=\mathrm{Blv} \\
& \varepsilon=5 \times 10^{-5} \times 40 \times 500 \\
& \varepsilon=1 \mathrm{~V}
\end{aligned}$