Faraday's law of induction can be expanded:$$V=-N\frac{d(BA)}{dt}$$ and for a circuit which creates an area between the wires if that area doesn't change then it becomes $$V=-N\frac{dB}{dt}A$$ The area of the formula is well defined. Suppose a capacitor is being (dis)charged during the (dis)charge a magnetic field is created inside the capacitor. What I don't get is what does the electric flux mean in the formula, of which area do we find $d(EA)/dt$ in order to get the magnetic field?