# Fundamental Physics/Formulas/Electromagnet

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## Electromagnet

It was discover by Ampere that when electric conductor conducts current it will generate magnetic field of field intensity

${\displaystyle B=LI}$

## Confirguration

 For a straight line conductor ${\displaystyle B=LI={\frac {\mu }{2\pi r}}I}$ For a circular loop made from straight line conductor ${\displaystyle B=LI={\frac {\mu }{2r}}I}$ For a coil of N circular loops made from straight line conductor ${\displaystyle B=LI={\frac {N\mu }{l}}I}$