Question

A satellite orbiting the Earth at 400 km above the surface of the Earth has a 2 m long antenna oriented perpendicular to the Earth's surface. At the equator the Earth's magnetic field is 8×10−5 T and is horizontal. Assuming the orbit to the circular, find emf induced across the ends of the antenna.(Given radius of earth Re ​=6400 Km)

Answer 1

$v=\sqrt{\frac{gR^2}{R+h}}=7.7~\frac{km}s,$

$\varepsilon=Blv=1.23~V.$