A small mass m is transferred from the centre of a hollow sphere of mass M to infinity. Find work done in the process. Compare this with the situation if instead of a hollow sphere, a solid sphere of same mass were there.

How will your weight be affected at the current location if earth is a hollow sphere instead of a solid sphere of same mass and radius?

A mass m is placed inside a hollow sphere of mass M as shown in figure. The gravitaional force on mass m is

A mass m is placed in the cavity inside hollow sphere of mass M as shown in the figure. The gravitational force on m is

If a solid and a hollow conducting sphere have same radius then

A point mass m is released from rest at a distance of 3R from the centre of a thin-walled hollow sphere of radius R and mass M as shown. The hollow sphere is fixed in position and the only force on the point mass is the gravitational attraction of the hollow sphere. There is a very small hole in the hollow sphere through which the point mass falls as shown. The velocity of a point mass when it passes through point P at a distance R//2 from the centre of the sphere is

Consider a system of two spheres of masses 5 kg and 25 kg. The distance between their centres is 1.2 m. What is the distance of their centre of mass from the centre of the sphere of mass 5 g?

Work done in moving a positive charge from the centre of a hollow uniformly charged sphere to its surface is zero. Does it imply that the potential is zero inside the sphere?