Define internal energy of a system .

What will be the change in internal energy of a system if no work is done on the system but q amount of heat is taken out from the system and given to the surroundings.

The change in internaL energy of a system depends on

Find the potential energy of a system of four particles each of mass m placed at the vertices of a square of side I .

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.

Define binding energy.

What is meant by internal energy of a thermodynamical system ?

Distinguish between the internal energy of a body and temperature.

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

Give the expression for potential energy of a system of two charges q_1 and q_2 in an external field.

Define lattice energy.