Hello, Say I have two concentric conducting rings, where r1 >> r2 (why is this important, btw?), and I run a time alternating current I(1) thru the larger one. This will create a magnetic field B (also) thru the smaller ring, which in turn will create itself a magnetic field B2 and so on. However, when asked "What is the magnetic field in the center of the rings", the answer is always that it is the magnetic field induced by I(1). How come the field generated by the smaller ring is not taken into account ?