Two identical coaxial circular coils are carrying current ‘i’ each in the same direction. If the coils approach each other, then

As the two identical coaxial circular loops carry a current i each circulating in the same direction, their flux add each other. When the two are brought closer, the total fluc linkage increase. By Lenz's a law a current will be induced in both the loops such that it opposes this change in flux. As the flux increases, the current in each loop will decreases so as to decrease the increasing flux.