This point is part of the HSC Physics syllabus Module 6: Electromagnetism under Electromagnetic Induction.

**Faraday’s law and Lenz’s law** are the basis for how motors work. This stems from Newton’s third law, that every action has an equal and opposite reaction. So when there is a change in flux through a coil, we’re going to see the opposite reaction through the voltage and current readings of the coil.

### Faraday’s Law

Any change in a magnetic field will induce a potential difference across a conductive surface proportional to the change in flux.

- V = voltage
- B = magnetic field
- A = area
- t = the time

### Faraday & Lenz’s Law

Lenz’s law states that the current produced from Faraday’s law creates a magnetic field which opposes that of the initial change in flux.

V= -N \frac{\delta BA }{\delta t}- V = voltage
- B = magnetic field
- A = area
- t = the time

Note: this has a minus before the N.