- #1
Solibelus
- 18
- 1
Hello everybody,
I'm studying classical electrodynamics and I'm having a difficulty grasping the concept of EMF.
I'll try to explain what causes my confusion.
Say I've got a conducting loop, an electrical wire, with some resistance R which contracts (or expands) with time.
Let's put that loop in a constant magnetic field (call it B) so that the wire is perpendicular to the magnetic flux.
Now I need a changing flux, so for simplicity, let's assume that the radius grows linearly.
Obviously the flux changes with time, so according to Faraday, EMF occurs and current flows through that loop.
My problem is this: I studied that in such cases, the flux is simply the magnetic field going through the area of the loop. Alright, but is the magnetic field only that constant B or is it B minus the magnetic field generated by the induced current (which is the result of the change in the flux itself!) ?This topic really confuses me![Frown :frown: :frown:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I'm studying classical electrodynamics and I'm having a difficulty grasping the concept of EMF.
I'll try to explain what causes my confusion.
Say I've got a conducting loop, an electrical wire, with some resistance R which contracts (or expands) with time.
Let's put that loop in a constant magnetic field (call it B) so that the wire is perpendicular to the magnetic flux.
Now I need a changing flux, so for simplicity, let's assume that the radius grows linearly.
Obviously the flux changes with time, so according to Faraday, EMF occurs and current flows through that loop.
My problem is this: I studied that in such cases, the flux is simply the magnetic field going through the area of the loop. Alright, but is the magnetic field only that constant B or is it B minus the magnetic field generated by the induced current (which is the result of the change in the flux itself!) ?This topic really confuses me
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