1. A more strict statement of Lenz's law is suggested.

2. Of course, this is Lenz's law in action.

3. How many of you know Lenz's law?

4. So Lenz's law says it's going to do whatever it can so that it retains no field inside.

5. Lenz's Law: the emf is an equal and opposite reaction to the flux change.

6. The teaching of the Lenz's law is a difficult point in electromagnetics teaching . The pedagogy inquiry of the Lenz's law is discussed in connection with this problem.

7. I made Lenz's Law the title... actually I couldn't think of a good title...

8. And it's the same thing as Le Chatelier's for pressure, or Lenz's law.