Write down an expression for the internal magnetic field of the proton responsible for the spin-orbit coupling and estimate its numerical value in Tesla, thus providing a quantitative range for the external field necessary to be considered in the "strong" or "weak" limits of the Zeeman effect. - Answer question throughly and with much detail as possible

Write down an expression for the internal magnetic field of the proton responsible for the spin-orbit coupling and estimate its numerical value in Tesla, thus providing a quantitative range for the external field necessary to be considered in the "strong" or "weak" limits of the Zeeman effect. - Answer question throughly and with much detail as possible