Does a Decreasing Magnetic Field Induce Conventional Current?

[learning_phys]

\xi = - \frac{dB}{dt}

Is the emf induced by a changing flux. Is the current created by this emf conventional current?

For example. Say there is a square loop in the plane of this page, with a decreasing magnetic field going INTO this page. This creates a clockwise current to battle the change in B. Now say there was a voltage supply attached to this loop so it looks like this:

|----------|
| x x x x x |
| x x x x x |
|---l |-----|
-V+

The voltage V gives a conventional current to go clockwise. Would the current introduced by scenario above add do this voltage or subtract?

I guess my question is, is the clockwise current induced by the decreasing magnetic field a conventional current?

 

[granpa]

think about it this way, there is energy stored in the magnetic field and that energy has to go somewhere.

 

[learning_phys]

and that does not help at all, gran(d)pa

 

[granpa]

how do you suppose that transformers work?

 

[LowlyPion]

\xi = - \frac{dB}{dt}
Is the emf induced by a changing flux.

Yes.

Is the current created by this emf conventional current?

Actually it's voltage by Faraday's Law of Induction. If there is an impedance for it to operate on then current flows.

For example. Say there is a square loop in the plane of this page, with a decreasing magnetic field going INTO this page. This creates a clockwise current to battle the change in B. Now say there was a voltage supply attached to this loop so it looks like this:

|----------|
| x x x x x |
| x x x x x |
|---l |-----|
-V+

The voltage V gives a conventional current to go clockwise. Would the current introduced by scenario above add do this voltage or subtract?

By the right hand rule the current would be clockwise as well.

I guess my question is, is the clockwise current induced by the decreasing magnetic field a conventional current?

Yes. It's a conductor. Presumably it has impedence somewhere in the circuit.