Faraday's Law of Induction

Magnetic braking is not an efficient way to stop a falling person.
Magnetic Flux is the amount of magnetic field passing through some area. It can be defined as
```
         magnetic flux   =  (magnetic field) * (effective area)

                         =  (magnetic field) * (area) * cos(theta)
```
where theta is the angle between the area and the magnetic field; it has the sense that theta = 0 degrees is face-on, and theta = 90 degrees is edge-on.
The units of magnetic flux are (Tesla * meter^2) = Weber

Faraday's Law says that the voltage induced in a loop of conducting material is equal the the rate of change of magnetic flux through it:

                                 change in magnetic flux 
         induced voltage =   N * ------------------------
                                     time to change

where N is the number of turns or coils of the conductor.