Is potential energy on the surface of earth always zero?

Deduce the expression for potential energy of a system of charges?

A mass thrown up returns to the surface of earth. What is the nature of total energy possessed?

Calculate the electric potential energy of the system of charges shown in figure.

Find the potential energy of a system of four particles each of mass m place at the vertices of a square fo side l. Also obtain the potential at the centre of the square.

The gravitational force between two objects of small masses on the surface of the earth can be neglected. Why?

If g is the acceleration due to gravity on the earth’s surface, the gain in the potential energy of an QBject of mass m raised from the surface of the earth to a height equal to the radius R of the earth is :

Can the electric potential be zero when the electric field is not zero ?

What is the potential energy of an object of mass 'm' at a height 'h'?