I can't seem to understand how to apply Lenz' law to a disc rotating in a magnetic field that is perpendicular to the discs plane (see first page on PDF):
I can see that using the right-hand rule, positive charge will build up on the edge and negative at the center. So an EMF will run from the outer edge to the center, but I can't seem to relate this to Lenz' law. The change in magnetic flux will just get larger because of the induced EMF, and not opposed?
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