Question

An artificial with a metal surface is moving about the earth in a circular orbit. An emf (neglecting declination) will be induced in the satellite, if

• A. the plane of the orbit coincides with the equatorial plane.
• B. the plane of the orbit is inclined to the equatorial plane.
• C. the plane of the orbit coincides with the equatorial plane and the speed of the satellite is less than 8 kmsec${}^{-1}$.
• D. no induced emf produced whatever may be the plane of the orbit.

Answer 1

Answer: (B)

the plane of the orbit is inclined to the equatorial plane.

If the latitude of earth remains the same in the orbit, then the flux through the loop made by the artificial satellite remains the same and hence no emf is induced.
magnetic flux density of the earth changes with the latitude. Therefore if the plane of the orbit of the sattelite is inclined at an angel to the equatorial plane, the flux density changes along the orbit and the flux changes and an emf would be induced.