# Fundamental Physics/Electricity/Electromagnetic field

 Conductors Configuration Mathematical Formulas 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 ${\displaystyle B=LI={\frac {N\mu }{l}}I}$