Hello, We're just starting to learn about electromagnetism and electromagnetic waves. I am still trying to grasp all these new concepts, but there's a question that's bugging me. From what I understood an alternating magnetic field will generate an alternating electric field which in turn will generate a magnetic field and according to Lenz's law the direction of this magnetic field will oppose the change in flux in the original magnetic field. Today in class, my teacher explained that an electromagnetic wave is produced by an alternating magnetic field that generates an alternating electric field and so on without end. My question is: How can these fields generate continuously without end? Doesn't Lenz's apply to these waves? (as it states that generated magnetic field will oppose the change in magnetic flux and so these fields won't generate without end). Did I just get it all wrong? Help appreciated!!! Thanks!