- #1
Galadirith
- 109
- 0
Homework Statement
Hi guys, I've recenlty done Faraday's law of induction in my AS physics class. I am really not understanding why it works. I get the Maths that's fine (PS were not doing integrals etc, were only doing the maths which invlove say given areas etc), but I don't see why its so.
So the Emf is proportional to the rate of change of Area, now I simply don't get this. I understand if the area is in reference to a surface that has some sort of continuous manifold, but we havnt even done anything like that, in fact the area in question is the area of a coil of wire. This really frustrates me as surly you would not want to be considering the area inside the coil, but rather the length of the coil because the coil wire is the only thing cutting lines of flux. Why is this so? Thanks guys.
Homework Equations
[tex]\mathcal{E} = -NA\frac{dB}{dt}[/tex]
[tex]N = Number\ of\ coils\ in\ wire[/tex]
[tex]A = Area\ inside\ coil[/tex]
[tex]B = Magnetic \Flux\ Density[/tex]