What structural formula represents 4 electrons shared between two atoms?

Sharing of 4 electrons between two atoms results in two double bonds. This can be see in the case of oxygen molecule (O2)

Atomic number of O = 8

Electron configuration of O = 1s²2s²2p⁴

Valence electron configuration: 2s²2p⁴

When 2 O atoms combine they share 4 electrons to form 2 double bonds. In addition, there are two lone pairs on each O atom.

Structural formula:  O=O

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

could you add the photo?

explanation: