Answer:
Lenz Law
Step-by-step explanation:
As per Lenz's law we know that direction of induced current is such that the magnetic field resulting from the induced current opposes the change in the field that caused the induced current.
This law is based upon the energy conservation principle as when magnetic field linked with the closed conducting loop changes then the work done to change the magnetic flux is used to induced the current and electrical energy in the closed loop.
As we know that when magnetic flux linked with the closed loop increases then the induced current in the loop will try to decrease the magnetic flux in such a way that its induced current will induce its magnetic field in opposite direction. And similarly if the flux linked with the closed loop decreases then induced current will increase the flux by inducing the magnetic field in the same direction