I have a question regarding Lenz's Law. In many of the passages that I read about Lenz's Law, I see this: "If the magnetic field of current i1 induces another current, i2, the direction of i2 is opposite that of i1." I don't think this is always true, though. For example, let's assume we have two straight conductors in close proximity. One of these conductors has an AC current flowing through it. For about half of each cycle, the magnitude of the current is decreasing. During this time, the magnetic field produced by that conductor will be in a given direction, but the change in magnetic field should be in the opposite direction. (The magnetic field is "decelerating") Because the magnetic field of an induced current must always oppose the change in the applied magnetic field, the magnetic field of the second conductor should be in the same direction as the magnetic field of the first conductor. This means that their currents should also be in the same direction. So, why is there a discrepancy?