As discussed above, as two objects approach each other, they spin and rotate around each other. As shown in Fig. , two rings form in an isothermal orbit. Supposing only one electron occupies the orbit with a velocity of v0 when an electron is put in, the velocities of two electrons must be halved because the velocity of one electron relative to the other is v0. Hence, the kinetic energy of one electron increases to 𝐸 , . It indicates that the paired electrons are superior to a single electron in energy. The paired electrons give a short radius. Although it coincides with the Pauli exclusion principle, here is the consequence of force analysis rather than an artificial assumption.