If two oppositely charged fields come into contact with one another they will merge with one another to form a jog.
Stress fields can be created by adding different sized atoms to the lattice (solute strengthening).
If a smaller atom is added to the lattice, a tensile stress field is created.
Similarly, if a larger atom is added to the lattice, a compressive stress field is created.
The stress fields created by adding solute atoms form the basis of the material strengthening process that occurs in alloys.