Two circular coils $P\&Q$  are kept coaxially & carry currents  $I_1$ and  $I_2$ respectively (all directions are w.r.t. the observer shown). Then 

if  $I_1=0\&Q$ moves towards  $P,$ a current in the opposite direction to that of  $I_2$ is induced in  $P$

when $I_1\ne 0$ and  $I_2\ne 0$ are in the same direction & $Q$  moves towards  $P$ then magnitudes of both  $i_1$ and  $i_2$  could increase.

when  $I_1\ne 0$ and  $I_2\ne 0$ are in the same direction & $P$  moves towards  $Q$ then magnitude of  $i_1$ could decrease.

when $I_1\ne 0$ and  $I_2\ne 0$ are in the same direction &  $P$  moves towards  $Q$ then magnitude of $i_1$ could increase.