Any surface S 1 that intersects the wire has current I passing through it so Ampère's law gives the correct magnetic field. However a second surface S 2 bounded by the same edge ⁠ ∂ ∂ S ⁠ could be drawn passing between the capacitor plates, therefore having no current passing through it. Without the displacement current term Ampere's law would give zero magnetic field for this surface. Therefore, without the displacement current term Ampere's law gives inconsistent results, the magnetic field would depend on the surface chosen for integration. Thus the displacement current term ⁠ ε ε 0 ∂ ∂ E / ∂ ∂ t ⁠ is necessary as a second source term which gives the correct magnetic field when the surface of integration passes between the capacitor plates. Because the current is increasing the charge on the capacitor's plates, the electric field between the plates is increasing, and the rate of change of electric field gives the correct value for the field B found above.