Question

what do we understand from Lenz Law? explain.

Answer 1

The magnetic flux changes so that induces a current. The current creates a magnetic flux whose change is the opposite way. Why does this not create yet another current?

Ultimately, the reason is because Maxwell’s equations are linear differential equations so you can’t bootstrap changes like that.

I think of Lenz’s law as an attempt by nature to keep the magnetic field unchanged. There is one changing field that induces a current with its own changing field. Those changes are opposed. The end.

Answer 2

Hey Friend,

Lenz Law is used to find the direction of induced current. 
It states that in all cases of electromagnetic induction, the direction of induced current is such that it always opposes the cause (motion of the conductor) that produces it.

Refer to the diagrams attached along with the answer...

In the diagram 10.25, north pole of magnet is approaching the end A. According to Lenz Law, the force should be opposed... so A acquires North pole. Therefore, the direction of current is anticlockwise.

In diagram 10.26, north pole of magnet is withdrawn from the end A. According to Lenz Law, the force should be opposed...so A acquires South pole. Therefore, the direction of the current is clockwise.

Hope it helps!