Exam-style question
Try this first
Which of the following correctly describes Lenz's law?.
- A.The induced emf opposes the change in magnetic flux
- B.The induced emf enhances the change in magnetic flux
- C.The induced emf is always positive
- D.The induced emf is independent of the magnetic field
Model answer
What a good answer should say
- The induced emf opposes the change in magnetic flux
Explanation
Why this works
Lenz's law states that the direction of the induced emf will always be such that it opposes the change in magnetic flux that produced it. This is a consequence of the conservation of energy.
Common mistake
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