fields 'coilness'?8)

[smm]

fields local variables are its potential P, strenght E, and... coilness? 8)
hmm..is it possible that field-lines can twist around a center certain way that potential-lines can cross in one spot

[HallsofIvy]

If a field has a potential, then potential lines can cross only at singularities: points at which the potential is not well defined.

By the way, it is incorrect to think of potential and strength as independent "variables". A field is completely determined by its potential function.

[smm]

oops, you are right:)

i was thinking can potential grow spirally:
-field lines twist to a spiraloid around 'twister source'. what would it mean?

[HallsofIvy]

Sounds like you are thinking of "vorticity" which is measured by the curl of the field.