7.2. In a hydrogen molecule, the potential energy of an electron is given by \[ V(r)=-\frac{e^{2}}{r_{1}}-\frac{e^{2}}{r_{2}} \] where \( r_{1} \) is the distance of the electron from the point \( (-a, 0,0) \), and \( r_{2} \) is the distance from the electron to the point \( (a, 0,0) \). Calculate the force on the electron.
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