A Semi-classical Upper Limit For Magnetic Fields Strength And the Case of Magnetars

In the pass from classical to modern physics, the idea of supposing some quantities having distinct or bounded values and keeping the rest continuous has been useful in treating many problems. In this paper, we suppose an upper limit for velocity of the classical particles and show applying this assumption to electromagnetism leads us to a maximum strength for magnetic fields which reveals an acceptable coincidence with the highest strengths in the cosmos, observed in magnetars.