Electromagnetic oscillation represents oscillation of 2 fields ; Electric field and Magnetic field perpendicular to each other ; found in an inductor's circuit

According to Maxwell, Electromagnetic oscillation can be describe by a set of 4 differential equations of 2 vector field namely Electric field and Magnetic field as follow

${\displaystyle \nabla \cdot E=0}$

${\displaystyle \nabla \times E=-{\frac {1}{T}}E}$

${\displaystyle \nabla \cdot B=0}$

${\displaystyle \nabla \cdot E=-{\frac {1}{T}}B}$

${\displaystyle T=\mu \epsilon }$