THE MODEL
Gauss’s law in integral form:
∮ E · dA = Q_enc / ε₀
Field lines are conserved: each line that starts on a charge must pierce the surface once. So the net count — the flux Φ — counts only the enclosed charge. Bulge the surface, shrink it, dent it: the same lines still cross it. For a spherically symmetric charge the field outside is E = kQ/r²; inside a uniform shell the interior field is exactly 0 (the shell theorem).
THE LINEAGE
Flux = enclosed charge is the same fact as Coulomb’s inverse square, recast. Integrate kQ/r² over a sphere: the r² in the field cancels the r² in the area, leaving 4πkQ = Q/ε₀, with no r left.
→ neighbour: the-coulomb-law — the point-charge force, promoted to the first of Maxwell’s four equations.
THE WITNESS
Live re-check: does the flux still ignore the surface radius? Two Gaussian spheres, radii r₁ and r₂, same enclosed charge — the witness re-computes both and compares. Green while they agree; it flips red the instant the Tamper (window 6) makes flux depend on r.
DATA IN in ↓
Enclosed charge Q = 1.60×10⁻⁹ C at the centre.
Two closed surfaces: sphere r₁ = 0.05 m and sphere r₂ = 7.30 m.
One extra charge placed outside both surfaces.
THE PANEL lit
DATA OUT out ↓
Proven result — the flux is set by the charge alone, not the surface:
THE ADVERSARY wall
“A bigger surface must catch more flux — it has more area, so it sees more field.”
THE GRAVEYARD
“Flux depends on how close the surface hugs the charge.”
→ No. Only the enclosed charge counts; the geometry cancels.
“A charge just outside the surface leaks a little net flux in.”
→ Zero. Every line an external charge sends in comes back out — net flux is exactly 0.
“Inside a charged shell the field points inward toward the wall.”
→ The interior field of a uniform shell is 0 everywhere (shell theorem).
THE TAMPER
Disclosed planted void: force the flux to depend on the surface radius (Φ ∝ Q/r). Two spheres of different radius will then disagree — and the Witness in window 7 catches it live.