# A Different Perspective – Lenz’s Law!

By Jaisen Leung in HSC
8th of April 2021

Faraday’s law and Lenz’s law are often seen as two separate laws. However, this article will delve into how Lenz’s law is really just an extension upon Faraday’s law and how you can show the marker just that!

Faraday’s law states that a conductor will induce an EMF if it experiences a change in magnetic flux. Lenz’s law on the other hand states that the induced current must flow such that it creates a magnetic field that opposes the change in flux.

While similar, the 2 key differences lie in the fact that:

1) Lenz’s law requires a closed circuit given that it requires a current to be formed. This is unlike Faraday’s law whereby the circuit does not need to be closed as only an EMF is induced.

2) This current will create a magnetic field to oppose the change in flux (hence the negative in the formula ). Faraday’s law does not indicate the direction of the induced EMF.

Understanding that the two laws are related, yet different is one thing. Showing that to the marker is another! When answering questions, you should incorporate both laws in your answer to show the marker that you are aware of the distinctions between the two. Let’s have a look at an example to demonstrate how this can be done.