Faraday’s Law
We also note that wL = A (area of circuit). We can also have N number of loops, so we finally get: DV = D(N B A) / Dt . This is called Faraday’s Law.
When we consider direction as well, we see that the magnetic field, B, has to cut through the area, A. If we assign a direction to A that is perpendicular to the surface, we get an even more general form:
DV = D[ (N B A cos(qBA) ] / Dt .