A circular loop of wire is positioned half in and half out of a square region of constant uniform magnetic field directed into the page (as shown in link below)

for clockwise current,

1)we can slowly take the ring out from the magnetic field region

2)we can rotate the ring

3)decrease the magnetic field

EXPLANATION :

the electromagnetic induction depends upon the rate of change of magnetic flux linked with the area of the loop(ring)

So, as we slowly take the ring out of the magnetic region, so magnetic field lines reduce,So by Faraday's Law of induction, the induced current will be such that it opposes the change..In our case the change is reduction ..So, By right hand thumb rule, if current is in clockwise direction the induced magnetic field due to current increases the already there magnetic field..

This same phenomenon is caused in each of the three cases i have mentioned above..

NOTE: it doesnt depend in which direction it is rotated.