Question

EARTH SATELLITE
Which of the following statement is correct about satellites?

• A. A satellite cannot move in a stable orbit in a plane passing through the earth's centre.
• B. Geostationary satellites are launched in the equatorial plane.
• C. We can use just one geostationary satellite for global communication around the globe.
• D. The speed of satellite increases with an increase in the radius of its orbit.

Answer 1

The correct option is B Geostationary satellites are launched in the equatorial plane.

Orbital speed of satellite, $v_o=\sqrt{\frac{G{M}_E}{r}}$
So, orbital speed of satellite decreases with the increase in the radius of its orbit. We need more than on satellite for global communication.
For stable orbit, satellite must pass through the centre of earth. only(b) is a correct statement.