Two heavy spheres each of mass \(100~\text{kg}\) and radius \(0.10~\text m,\) are placed \(1.0~\text m\) apart on a horizontal table. What is the gravitational potential at the midpoint of the line joining the centres of the spheres?
1. \(2.67\times10^{-8}~\text{J/kg}\)
2. Zero
3. \(6.67\times10^{-9}~\text{J/kg}\)
4. \(3.71\times10^{-8}~\text{J/kg}\)