Magnetic Field
A magnetic field exerts an invisible force that substances are sensative to magnetism.
Magnetic Field formula
\(\large{ B = \frac {\mu \; I \; N} {l} }\)
Where:
\(\large{ B }\) = magnetic field
\(\large{ \mu }\) (Greek symbol mu) = permeability
\(\large{ I }\) = current intensity flowing in the cable
\(\large{ N }\) = number of turns of the wire
\(\large{ l }\) = length of the solenoid