Question

can someone help me with lenz's law...i understand the theoretical part i need to understand its applications

Answer 1

Do u want the explanation of the loops

Answer 2

If loop A has a changing current then the flux through loop B is changing. This changing flux creates an electric field which drives a current in B. But this current in B produces a new field which is also changing so A is now experiencing a changing field as well.
In fact, the changing current in A already affects A even without the B loop (this is called self inductance).
So an extra current in A develops that tries to resist the change in flux due to the new current in B.
You should try to convince yourself that this current will add (rather than subtract) to the current already present in A because the B loop will tend to make the magnetic field passing through the A loop smaller (just get your current directions right and use the right hand rule).

Answer 3

The application of Lenz's law,
consider a coil of wire to which a battery is suddenly connected. Suppose that the battery starts a current flowing clockwise, as viewed by the observer. This current will give rise to a magnetic field whose lines will thread the coil and circle back outside it. Thus, as the current due to the battery builds up, there is a changing magnetic flux through the coil and this must result in an induced emf in the coil.
what is the direction of this induced emf? Lenz's law tells us immediately that it must be counterclockwise, so as to oppose the building up of the current.
Similarly, when the current in a circuit is broken, the induced emf seeks to keep the current from dying out, and this accounts for the sparking observed when switches are opened slowly. the induced emf in a circuit whose current is changing is called the back emf,
since it always opposes the alteration in the current. It arises from the change in the current's own magnetic field, and effect referred to as self-inductance.

Answer 4

lentz's law: when magnetic lines of force is increases or decreases in the loop then induced emf generates in that direction which oppose this changing i.e the induced emf is given by following expression:
emf(induced)=-d(flux)/dt....here negative sign show that chnge in the flux is in opposite direction to emf(induced)...which is clear from the figure.. ,Here i is induced current which is follow due to change in magnetic lines of forces in the loop i.e change in flux in the loop, and this induced current also generates magnetic lines of force which is in the opposite direction to the applied magnetic lines of force,therefore induced magnetic lines of force(due to induced current) opposes the changing in the loop ....