^{2}describes a way to store energy. This approach clearly represents what we will talk about next.

Recall that the electron charge is \(e = 1.6 \cdot 10 ^ {- 19} \) (Kl), and the classical radius of an electron is \(r_ {e} = 2.82 \cdot 10 ^ {- 15} \) (m).

But the resulting formula is exactly half the Einstein mass-energy: \[W_ {ce} = \frac {e ^ {2}} {8 \pi \varepsilon _ {0} r_ {e}} \; = \; \frac {m_ {e} c ^ {2}} {2}, \qquad (2.4) \] where: \(m_ {e} \) — electron mass equal to \(9.1 \cdot 10 ^ {- 31} \) (kg), \(c \) — the speed of light is equal to \(3 \cdot 10 ^ {8} \) (m/s). Thus, we got a bunch: ** charge-mass-energy ** and answered the question — where does the energy come from.

The potential energy of the system of electrons will be maximum if the capacity of the capacitor in which they are located tends to zero. Apparently, such a limiting state of the system of electrons is an electron gas or an electron plasma in vacuum.

This is the same answer to the original question — Where does the energy go if the capacity of the system of electrons is increased? Electrons are simply bound by the capacity and cease to be free, and the larger the capacity, the more they are bound.

**electron model**, suitable for our further calculations and research: outside of it there is an electric charge, and inside there is a magnetic charge. We will further support the second statement by the presence of inductance in the electron.

Since an electron is a kind of elementary capacity, why can't it be the same elementary inductance? Indeed, we find such a justification in work [2], from where we take the formula for the inductance of an electron: \[L_ {e} = \frac {m_ {e}} {n \, e ^ {2}} = {m_e r_e ^ 2 \over e ^ 2} = \frac {\mu_ { 0} r_ {e}} {4 \pi} \qquad (2.5) \] where: \(n \) - specific charge density, \(\mu_ {0} \) — magnetic constant equal to \(1.26 \cdot 10^{-6} \) (H/m). Formula (2.5) is obtained if only one charge is taken as \(n \). By the way, in [3] it is proposed to consider such an inductance an analogue of the mass of a substance.

**all of its potential energy is reactive**. It becomes active when the electron becomes a wave, and we can feel the manifestations of this energy in the form of light, heat, etc.

- classic radius: \(r_ {e} = 2.82 \cdot 10 ^ {-15} \) (m);
- mass: \(m_ {e} = 9.1 \cdot 10 ^ {-31} \) (kg);
- charge: \(e = 1.6 \cdot 10 ^ {-19} \) (C);
- surface potential: \(\varphi_e = 5.1 \cdot 10 ^ 5 \) (V);
- own capacity: \(C_ {e} = 3.14 \cdot 10 ^ {-25} \) (F);
- self-inductance: \(L_ {e} = 2.82 \cdot 10 ^ {-22} \) (H);
- wave impedance: \(Z_ {e} = \sqrt {L_{e} / C_ {e}} = 30 \) (Ohm);
- Thompson resonant frequency: \(\nu_ {e} = \frac {1} {2 \pi \sqrt {L_ {e} C_{e}}} = 1.69 \cdot 10^{22} \) (Hz);
- wavelength: \(\lambda_ {e} = c / \nu_ {e} = 1.77 \cdot 10 ^ {-14} \) (m).