The coulombic force between two charges is $$ F = \frac{k q_{1} q_{2}}{r^{2}} $$ For two negative charges this will be repulsive. From the equation, as $r$ tends to zero the force approaches infinity. Which implies an infinite amount of energy is needed to bring the two particles together. My qu...

The elastic properties of any substance is because of the restoring intermolecular forces operating in it. And I read that the isothermal elasticity of an ideal gas is given by $E_{isothermal} = P$ And also we can define elasticity of the ideal gas in an adiabatic process. But I don't know how ca...