# Fundamental Physics/Electromagnetic induction

## Electromagnetic induction

Faraday discovered that electric potential can be generated from magnetic field

## Magnetic coil of N circular loops

For a coil of N circular loops . Magnetic field strength

${\displaystyle B=LI}$

This magnetic field generates induced magnetic field strength

${\displaystyle \phi =-NB=-NLI}$

Electric potential of the magnetic and induced magnetic fields above

Magnetic field potential strength

${\displaystyle V_{B}={\frac {dB}{dt}}=L{\frac {dI}{dt}}}$

Induced magnetic field potential strength

${\displaystyle V_{\phi }=-{\frac {d\phi }{dt}}=-NL{\frac {dI}{dt}}}$