The stratosphere acts as a conducting layer ofr the earth. If the stratosphere extends beyond 50 km from the surface of earth, then calculate the capacitance of the spherical capacitor formed between stratosphere and earth's surface. Take radius of earth as 6,400 km.

The capacitance of the earth viewed as a spherical conductor of radius 6408 km is

A body of mass 6 kg is kept at a height of 5 m from the surface of earth. Find the potential energy of the body.

If the value of acceleration due to gravity at a height of 100 km from the surface of earth is g ',then at what depth ,value of acceleration due to gravity wioll again be g'?

As you have learnt in the text, a geostationary satellite orbits the earth at a height of nearly 36,000 km from the surface of the earth. What is the potential due to earth’s gravity at the site of this satellite ? (Take the potential energy at infinity to be zero). Mass of the earth = 6.0Xx10^24 kg , radius = 6400 km.