Hello, 1. The problem statement, all variables and given/known data All variables and known data are given in one of the attached files. Does the figure 8.2 show that the current I1 is constant? My assumption is based on Lenz's law. What I mean is that if the I1 varies, there will be changes in magnetic fluxes(delta-B) produced by I1. The circuit C2 will oppose this change by forming its current I2; consequently, there will be fluxes, which are generated by I2, that will penetrate C1 also. Therefore, the assumption will not happen if I1 is constant. 2. Relevant equations depicted in one of the attached files. 3. The attempt at a solution I both study the mutual inductance in the textbook containing the following pictures and Lenz's law. Also, I try to combine them together. I just want to check my understanding.